Happiness is not at the top of the mountain, but in how to climb.

He who learns but does not think, is lost! He who thinks but does not learn is in great danger... Men of superior mind busy themselves first getting at the root of things; when they succeed, the right course is open to them.

There is only one thing in life which never changes, and it is change.

Know what you know and know that you don't know what you don't know — that is the characteristic of one who knows.

He who cannot describe the problem will never find the solution to that problem.

Charity is that rational and constant affection which makes us sacrifice ourselves to the human race, as if we were united with it, so as to form one individual, partaking equally in its adversity and prosperity.

If the gentleman is not serious, he will not be respected, and his learning will not be on a firm foundation. He considers loyalty and faithfulness to be fundamental, has no friends who are not like him, and when he has made mistakes, he is not afraid of correcting them.