Roger Bacon, scholastic accolade Doctor Mirabilis meaning "Wonderful Teacher"

When any of the four pillars of the government, religion, justice, counsel, and treasure, are mainly shaken or weakened, men have need to pray for fair weather.

Wives are young men

Write down the thoughts of the moment. Those that come unsought for are commonly the most valuable.

We are much beholden to Machiavelli and others that write what men do, and not what they ought to do.

Virtue is like a rich stone, best plain set.

Vain-glorious men are the scorn of the wise, the admiration of fools, the idols of paradise, and the slaves of their own vaunts.

Travel, in the younger sort, is a part of education; in the elder, a part of experience. He that travelleth into a country before he hath some entrance into the language, goeth to school, and not to travel.

Truth emerges more readily from error than from confusion.

Time is the greatest innovator. [Time is the greatest of innovators.]

There is no worse torture than the torture of laws.

They are ill discoverers that think there is no land, when they can see nothing but sea.

They that deny a God destroy man

There is as much difference between the counsel that a friend giveth, and that a man giveth himself, as there is between the counsel of a friend and a flatterer.

There is no excellent beauty that hath not some strangeness in the proportion

There are two modes of acquiring knowledge, namely by reasoning and experience. Reasoning draws a conclusion and makes us grant the conclusion, but does not make the conclusion certain, nor does it remove doubt so that the mind may rest on the intuition of truth, unless the mind discovers it by the path of experience.

There is a wisdom in this beyond the rules of physic: a man

The worst solitude is to be destitute of sincere friendship.

There are four great sciences, without which the other sciences cannot be known nor a knowledge of things secured ... Of these sciences the gate and key is mathematics ... He who is ignorant of this [mathematics] cannot know the other sciences nor the affairs of this world.

The sum of behaviour is to retain a man

The ways to enrich are many, and most of them foul.

The strongest arguments prove nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences and the goal of all speculation.

The place of justice is a hallowed place.

The speaking in a perpetual hyperbole is comely in nothing but love.

The lame man who keeps the right road outstrips the runner who takes a wrong one. Nay, it is obvious that the more active and swift the latter is the further he will go astray.

The mind is the man, and knowledge mind; a man is but what he knoweth.