If you have no problems, then you have no clue to what is going.
Science may set limits to knowledge, but should not set limits to imagination.
Having a great intellect is no path to being happy.
Never put off for tomorrow, what you can do today.
We are all born ignorant, but one must work hard to remain stupid
Nobody made a greater mistake than he who did nothing because he could do only a little.
A friend to all is a friend to none
If you don't want to slip up tomorrow, speak the truth today.
Tis very certain the desire of life prolongs it.
Words mean more than what is set down on paper. It takes the human voice to infuse them with deeper meaning.
The lie is a condition of life.
Nothing is more intolerable than to have to admit to yourself your own errors.
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.
The more that you read, the more things you will know. The more that you learn, the more places you'll go.
To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact
Courage is resistance to fear, mastery of fear - not absence of fear.
Without courage, wisdom bears no fruit.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
Where there is anger, there is always pain underneath.
Rest satisfied with doing well, and leave others to talk of you as they please.
A crust eaten in peace is better than a banquet partaken in anxiety.