Never think that you already know all. However highly you are appraised, always have the courage to say of yourself: I am ignorant.

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.

As in all things, we suffer from excess in reading too. Many books are a burden, not an ornament.

-- Seneca

I fear the man of a single book.

-- Thomas Aquinas

An eye for an eye only ends up making the whole world blind.

-- Mahatma Gandhi

It is impossible to govern the universe without God and the Bible.

-- George Washington

What do I care about my chatter from yesterday?

-- Konrad Adenauer

We are all in the same boat.

-- Konrad Adenauer