Simplicity is the ultimate sophistication.
The greatest deception men suffer is from their own opinions.
Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.
He who wishes to be rich in a day will be hanged in a year.
Reprove your friend in secret and praise him openly.
Fear arises sooner than anything else.
We ought not to desire the impossible.
It is easier to resist at the beginning than at the end.
Where there is most feeling, there is the greatest martyrdom.
Wisdom is the daughter of experience.
He who walks straight rarely falls.
We, by our arts may be called the grandsons of God.
What is fair in men, passes away, but not so in art.
Poor is the pupil that does not surpass his master.
Man has much power of discourse which for the most part is vain and false; animals have but little, but it is useful and true, and a small truth is better than a great lie.
Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.
When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return.
I know that many will call this useless work.
It is true that impatience, the mother of stupidity, praises brevity, as if such persons had not life long enough to serve them to acquire a complete knowledge of one single subject, such as the human body; and then they want to comprehend the mind of God in which the universe is included, weighing it minutely and mincing it into infinite parts, as if they had to dissect it!