If you want new ideas, read old books.

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.

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

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 know that I know nothing.

-- Socrates

I know that I do not know.

-- Plato

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

-- Confucius

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

-- Confucius

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

The trouble with people is that they love playing teacher to others.

-- Mencius