The comments on the prior post lead to an interesting question. Does every personal leading reflect a leading or opening from the Spirit of Christ?  

If this is answered, " yes" then how do we account for the various times in our lives when we see or read about people making outlandish or destructive statements which they attribute to the inspiration of the spirit of God?   To make it more personal, how many times do we feel we think we are expressing the Spirit of Christ when we later see how our own personal interests, our family or community, or our emotional and mental confusion influenced our ability to be led by the Spirit of Christ.   And what accounts for the many disagreements within the Quaker community involving experienced elders that have led or may lead Quakers to believe they are unable to fulfill their calling as Quakers without separate organizations?

If this question is answered, "no" then how can we encourage anyone to be guided by the Spirit of Christ.  Fox and other early Quakers addressed this question frequently, and I am sure we see Friends demonstrating the negative results that occur when this question is not addressed.
Some people quote modern writers who have no connection to Christianity or early Quaker thought and ask us to believe their statements to be true and or inspired with no need for further evidence to tie it in to a Quaker discussion.  Therefore no test of what is helpful or harmful, what is true or false, what is consistent with the movement of the spirit in the past is necessary.

 
Anyone, who claims they are inspired and will describe what is true and false in each religious movement because they are prophets and speaks the word of the spirit to everyone else, will be questioned by any able minded person.  A person from a religious point of view that did not acknowledge the self proclaimed prophet's assessment of their religion would be excluded from the community of the enlightened.  In times of self absorption, each wishes that we are the lord's prophet whose utterance is unquestioned, but we know from experience we all are not.  
Because someone is egotistical enough to try to convince people they can create a sound foundation for their house by picking grains of sand from the various religions of the world, they will not be exempt from the consequence of such behavior.  Matt 7:26  Everyone who hears these words of mine, and doesn't do them will be like a foolish man, who built his house on the sand. 27 The rain came down, the floods came, and the winds blew, and beat on that house; and it fell—and great was its fall."     WEB

The early Quakers knew not every spirit was an honest and helpful spirit.  Fox wrote an article entitled "Word Of Admonition To Such As Wander From The Anointing And Teaching Within, And From The Father And The Son" In Works of George Fox(Volume 6) First he recognized that people do wander from the truth.
    "And the gospel of salvation being preached to every creature under heaven, which gospel ‘is the power of God to salvation, to every one that believes,' doth establish men; but all they that have wandered from the gospel, they have wandered from the power of God, which should save them, and that in which they should be established, and should bring life and immortality to light in them; and such remain in darkness, and do not know whither they go or wander."

    Next he identifies two ways this can happen.  "And the apostle did prove that Jesus was Christ, by Moses and the prophets; and when he had proved this to the Jews, that had Moses, and the prophets, and the promises, that prophesied of Christ; and when that Christ was come, according to the promises, and according to Moses and the prophets, and proved and manifested himself to be the Christ by signs and miracles, and then after the Jews had crucified him, and he died, and was buried, and rose again, and ascended, is set at the right hand of God, (according to the scripture,) and when many believed in Christ Jesus, then the apostles bid them ‘prove themselves whether they were in the true faith, (to wit, that true faith which Jesus Christ was the author and finisher of,) and try, and prove, and know themselves how that Jesus Christ was in them, except they were reprobates.' So here the first proof was, to prove by the scriptures of Moses and the prophets, and the promises, and the figures, types, and shadows, that Jesus was the Christ, and the substance of them, both to the Jews, and the world.

    And the second proof was, that when christianity was spread abroad, and many did believe in Christ Jesus, the apostle bids the Christians 'try themselves, and prove and know themselves, if that Christ Jesus was not in them, they were reprobates;' and he that had not the spirit of God, he had not life, and he that had not the spirit of Christ, he was none of his, and none can call Jesus Lord but by the holy ghost. So all the true christians must have the same holy ghost and Christ in them that the apostles had, if they truly call Jesus Lord and master, and are his, for the wicked Jews and Judas could call Jesus Lord or master, but it was by the unclean ghost.
    Now what is the matter that all people in the world, that profess God, are not the sons of God? The reason Christ and the apostle tells you, because that they do not receive Christ, and are not led by the spirit of God, but rebel against it, and are led by the devil, the spirit of that wicked one;"

Hugh Barbour set out what he saw in early Quaker life from his perspective in Quakers in Puritan England (1964) Five Tests for Discerning A True Leading and this part was reproduced as a tract by http://www.tractassociation.org/tracts/tests-discerning-true-leading/
Barbour recognizes a need for tests of personal inspiration by stating: "Early Friends faced the daily job of recognizing the true from the subjective when they were led to speech and action. From Jeremiah's time to the present, men have known no absolute or easy way to tell a genuinely divine message from wishful impulses and false prophecy.
The problem was made urgent for the Quakers because they were regularly labeled by men of their time as ‘Ranters.‘"

After further discussion, he included a paragraph on each of the five tests.  1. Moral Purity.  2.  Patience.  3. Consistency with others.  4. Consistency with the Bible.  and  5.  Inward unity.

Fox writes in the above article that two tests are related. One is the truths in Scripture showing what Christianity is and where it comes from, and the other is the application of those truths to our own lives.  The reason Fox places his primary emphasis on the second test was because the first was seldom a problem.  Most believed the facts, but few resisted the influence of organized religion in obscuring the application of the facts to the life of the individual and to the assembly of Christians thereby hiding an essential teaching and distorting scripture.   With a more complete scriptural approach, early Quakers built a solid foundation by including a Biblical basis for their beliefs.  The above is evidence of two planks of which it was constructed.