A conditioned reflex is a temporary connection between any agent of the external world and a definite activity of the organism.

If you want new ideas, read old books.

Gradualness and discipline. This is the most important thing. From the very beginning of your work, train yourself to the strictest gradualness in accumulating knowledge.

I will not sacrifice even the hind leg of a frog to the kind of social experiment that the Communist government is conducting in Russia.

I know that I know nothing.

-- Socrates

I know that I do not know.

-- Plato

I, Shinran, have not a single disciple.

-- Shinran

The highest goodness is like water. Water benefits all things and does not compete; it dwells in places others disdain, and so is close to the Tao.

-- Laozi

I transmit but do not create; I trust in and love the ancients.

-- Confucius

When three walk together, one is surely my teacher. I follow what is good and correct what is not.

-- Confucius