A well-spent day brings happy sleep.

All our knowledge has its origin in our perceptions.

Once you have flown, you will walk the earth with your eyes turned skywards, for there you have been, and there you long to return.

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.

I have from an early age abjured the use of meat, and the time will come when men will look upon the murder of animals as they now look upon the murder of men.

Simplicity is the ultimate sophistication.

You do ill if you praise, but worse if you censure, what you do not understand.

As a well-spent day brings happy sleep, so life well used brings happy death.

Anyone who invokes authors in discussion is not using his intelligence but his memory.

As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.

Where the spirit does not work with the hand, there is no art.

The faculty of imagination is both the rudder and the bridle of the senses.

Supreme happiness will be the greatest cause of misery, and the perfection of wisdom the occassion of folly.

Life well spent is long.

Men of lofty genius when they are doing the least work are most active.

The greatest deception men suffer is from their own opinions.