Sincerity, thus, is relative, and the insincere are those whose purposes, declared by themselves to be altruistic, are none the less egoistic, whose attachments and affections, loudly protested, are not lasting and never intense, and whose manners do not reflect what they themselves are but what they think will be pleasing and acceptable to others. The relatively sincere seek to make their outer behavior conform, within the possibilities, to their inner natures; they are polite but not gushing, devoted to their friends at heart and in deed, but not too friendly to their enemies or to those they dislike, and they believe in their own purposes as good. The unhappiest state possible is when one starts to question the sincerity and validity of one's own purposes, from which there results an agonizing paralysis of purpose. The sincere inspire with faith and cooperation, if there is a unity of interest, but it must not be forgotten that others are inspired to hatred and rivalry, if the sincerity is along antagonistic lines. We are apt to forget that sincerity, like love, faith and hope, is a beautiful word, but the quality of sincerity, like the other qualities, may be linked with misguided purpose. No one doubts the sincerity of the Moslem hordes of the eighth century in desiring to redeem the world for Mahomet, but we are quite as sincerely glad that sturdy Charles Martel smashed them back from Europe. Their very sincerity made them the more dangerous. In estimating any one's sincerity, it is indispensable to inquire with what other qualities is this sincerity linked,--to what nouns of activity is it a qualifying adjective? Honesty, truthfulness and sincerity are esteemed because there is in our social structure the great need that men shall trust one another. The cynic and the worldly wise, and also the experiences of life, teach "never trust, always be cautious, never confide in letter or speech," curb the trusting urge in our nature. The betrayal of trust is the one sin; all other crimes from murder down may find an excuse in passion or weakness, but when the trusting are deceived or injured, the cement substance of our social structure is dissolved and the fabric of our lives threatened. To trust is to hand over one's destiny to another and is a manifestation of the mutual dependence of man. It is in part a judgment of character, it is in part an original trait, is an absence of that form of fear called suspicion and on its positive side is a form of courage.