Never ruin an apology with an excuse.
The wise man should restrain his senses like the crane and accomplish his purpose with due knowledge of his place, time and ability.
It is necessary to keep one's compass in one's eyes and not in the hand, for the hands execute, but the eye judges.
Each problem that I solved became a rule which served afterwards to solve other problems.
Those who cannot work with their hearts achieve but a hollow, half-hearted success that breeds bitterness all around.
Act enthusiastic and you will be enthusiastic
The smaller the mind, the greater the conceit.
Tomorrow hopes we have learned something from yesterday.
When prosperity comes, do not use all of it.
Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.
What you're thinking is what you're becoming.
Never put off for tomorrow, what you can do today.
Be realistic: Plan for a miracle
Don't compromise yourself. You are all you've got.
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
If we do not lay out ourselves in the service of mankind whom should we serve?
Doubt is the origin of wisdom
It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.
When you learn, teach, when you get, give.
Whatever it is you're seeking won't come in the form you're expecting.
It is man that makes truth great, not truth that makes man great.