Loving the same man or woman all your life, why, that's like supposing the same candle could last you all your life

A man on a thousand mile walk has to forget his goal and say to himself every morning, 'Today I'm going to cover twenty-five miles and then rest up and sleep.

Man has received direct from God only one instrument wherewith to know himself and to know his relation to the universe--he has no other--and that instrument is reason.

We can know only that we know nothing. And that is the highest degree of human wisdom.

It is very difficult to tell the truth.

I began to realize that the most profound wisdom of man was rooted in the answers given by faith and that I did not have the right to deny them on the grounds of reason; above all, I realized that these answers alone can form a reply to the question of life.

So long as people do not consider all men as their brothers and do not consider human life as the most sacred thing, which rather than destroy they must consider it their first and foremost duty to support; that is so long as people do not behave towards one another in a religious manner, they will always ruin one another's lives for the sake of personal gain.