"A creature that cannot grasp the mutual exclusiveness of A and not A has no difficulty in lying; more than that, such…"

"The deepest, the intelligible, part of the nature of man is that part which does not take refuge in causality, but wh…"

"The great genius does not let his work be determined by the concrete finite conditions that surround him, whilst it i…"

"Memory, then, is a necessary part of the logical faculty. … The proposition A = A must have a psychological relation …"

"That which enables man to have a real relation to truth and which removes his temptation to lie, must be something in…"

"The logical axioms are the principle of all truth. These posit an existence towards which all cognition serves. Logic…"

"A man is first reverent about himself, and self-respect is the first stage in reverence for all things."

"A man is himself important precisely in proportion that all things seem important to him."

"The great man of science, unless he is also a philosopher, … deserves the title of genius as little as the man of act…"

"Not only virtue, but also insight, not only sanctity but also wisdom, are the duties and tasks of mankind."