Self-conceit may lead to self destruction. — Aesop

There are other measures of self-respect for a man, than the number of clean shirts he puts on every day. — Ralph Waldo Emerson
No man who is occupied in doing a very difficult thing, and doing it very well, ever loses his self-respect. — George Bernard Shaw
To thine own self be true, and it must follow, as the night the day, thou canst not then be false to any man. — William Shakespeare
The level of our success is limited only by our imagination and no act of kindness, however small, is ever wasted. — Aesop
Every truth has two sides; it is as well to look at both, before we commit ourselves to either. — Aesop
A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him. — Aesop