He who learns but does not think, is lost! He who thinks but does not learn is in great danger.

I am an old man and have known a great many troubles, but most of them never happened.

Do the difficult things while they are easy and do the great things while they are small. A journey of a thousand miles must begin with a single step.

Suffering becomes beautiful when anyone bears great calamities with cheerfulness, not through insensibility but through greatness of mind.

My books are like water those of the great geniuses are wine. (Fortunately) everybody drinks water.