insight at all. Mere experience may make us acquainted with the wiles of men and the "tricks of the trade"; it may also give us discretion, adaptability, and other prudential accomplishments. The real issues come in sight when we look beyond mere self-interest to the realm of ideals. Strictly speaking, this is a moral question, but we shall still find our way by keeping close to the lines of approach to the ethical ideal which psychological analyses disclose.

Some one has said that nothing is so dangerous as a half-truth. The difficulty is that not even the prophets of such doctrines know that they are half-truths, while the scholars who could expose and correct are engaged elsewhere. This is well seen in the case of beliefs which we examined in our study of subconsciousness: a half-truth accepted means false inferences all along the line. We are sure of our inferences only in case we as individuals possess sufficient knowledge of the human mind to know what processes are central. It is imperative, therefore, that each of us shall acquire a standard by which to discern the realities and truths from the appearances and errors with which they are commingled. This calls for criticism not only of the instincts and prejudices by which we are ordinarily influenced but of the supposably peculiar powers which we differentiate as "psychical" to the disparagement of reason.