Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.
None but ourselves can free our minds.
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.
No act of kindness, no matter how small, is ever wasted.
It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.
One never notices what has been done; one can only see what remains to be done.
Stubborn and ardent clinging to one's opinion is the best proof of stupidity.
Experience teaches us that it is much easier to prevent an enemy from posting themselves than it is to dislodge them after they have got possession.
Science may set limits to knowledge, but should not set limits to imagination.
Power always thinks it has a great soul and vast views beyond the comprehension of the weak.
Men build too many walls and not enough bridges.
If you do not know the laws of right conduct, you cannot form your character.
The only way to get the best of an argument is to avoid it.
Moderation in temper is always a virtue; but moderation in principle is always a vice.
We are all born ignorant, but one must work hard to remain stupid
A house divided against itself cannot stand.
Common sense is in spite of, not as the result of education.
Turn your wounds into wisdom.
Jealousy is the tribute mediocrity pays to genius.
It is a wise man that does know the contented man is never poor, whilst the discontented man is never rich.
Energy may be likened to the bending of a crossbow; decision,to the releasing of a trigger.