Zen literature is all brimful of such statements, which seem to have been uttered so casually, so innocently, but those who actually know what Zen is will testify to the fact that all these utterances dropped so naturally from the lips of the masters are like deadly poisons, that when they are once taken in they cause such a violent pain as to make one’s intestines wriggle nine times and more, as the Chinese would express it. But it is only after such pain and turbulence that all the internal impurities are purged and one is born with quite a new outlook on life. It is strange that Zen grows intelligible when these mental struggles are gone through. But the fact is that Zen is an experience actual and personal, and not a knowledge to be gained by analysis or comparison. “Do not talk poetry except to a poet; only the sick know how to sympathise with the sick.” This explains the whole situation. Our minds are to be so matured as to be in tune with those of the masters. Let this be accomplished, and when one string is struck, the other will inevitably respond. Harmonious notes always result from the sympathetic resonance of two or more chords. And what Zen does for us is to prepare our minds to be yielding and appreciative recipients of old masters. In other words, psychologically Zen releases whatever energies we may have in store, of which we are not conscious in ordinary circumstances. Some say that Zen is self-suggestion. But this does not explain anything. When the word “Yamato-damashi” is mentioned, it seems to awaken in most Japanese a fervent patriotic passion. The children are taught to respect the flag of the rising sun, and when the soldiers come in front of the regimental colours they involuntarily salute. When a boy is reproached for not acting like a little samurai and disgracing the name of his ancestor, he at once musters his courage and will resist temptations. All these ideas are energy-releasing ideas for the Japanese, and this release, according to some psychologists, is self-suggestion. Social conventions and imitative instincts may also be regarded as self-suggestions. So is moral discipline. An example is given to the students to follow or imitate it. The idea gradually takes root in them through suggestion, and they finally come to act as if it were their own. Self-suggestion is a barren theory, it does not explain anything. When they say that Zen is self-suggestion, do we get any clearer idea of Zen? Some think it scientific to call certain phenomena by a term newly come into fashion, and rest satisfied with it as if they disposed of them in an illuminating way. The study of Zen must be taken up by the profounder psychologists.