The earth exists not for us but for itself; the Sun shines not for us, but for its own life!

Obedience is the greatest refuge of the weak and the coward people!

Do not underrate others, do not underrate yourself, and do not underrate anything! Do not overrate others, do not overrate yourself, and do not overrate anything!

If you are a good student of life, wisdom becomes your rain, falling heavily on your mind!

When the life is wavy, keep your mind smooth!

The demands of the science, of the ethics and of the reason are superior to the demands of the people!

Wise man is a good Sherpa; he takes you to the highest places!