In youth we learn; in age we understand.
Whoever prefers the material comforts of life over intellectual wealth is like the owner of a palace who moves into the servants’ quarters and leaves the sumptuous rooms empty.
An opinion may be controverted; a prejudice, never.
To have and not to give is often worse than to steal.
The believer who has never doubted will hardly convert a doubter.
There is only one proof of ability - action.