Two things a man can not hide: that he is drunk, and that he is in love.

It's a famous epigram written by ancient Greek writer Antiphanes.

Oscar Wilde wrote another famous epigram:

Experience is the name everyone gives to his mistakes.

Another famous quote from Leo Tolstoy:

Ideal is the beacon. Without ideal,there is no secure direction; without direction, there is no life.

Another interesting piece of English material:

(banned)