The effect of speech upon the condition of the soul is comparable to the power of drugs over the nature of bodies. For just as different drugs dispel different secretions from the body, and some bring an end to disease and others to life, so also in the case of speeches, some distress, others delight, some cause fear, others make the hearers bold, and some drug and bewitch the soul with a kind of evil persuasion. Gorgias

To accept it without arrogance, to let it go with indifference. Book VIII

The most comprehensive formulation of therapeutic goals is the striving for wholeheartedness: to be without pretense, to be emotionally sincere, to be able to put the whole of oneself into one's feelings, one's work, one's beliefs. Our Inner Conflicts: A Constructive Theory of Neurosis

It is not right to vex ourselves at things, For they care not about it. Book VII