The strictest law often causes the most serious wrong.

There is no duty more obligatory than the repayment of kindness.

The wise are instructed by reason ordinary minds by experience the stupid, by necessity and brutes by instinct.

The first duty of a man is the seeking after and the investigation of truth.

Strain every nerve to gain your point.

The absolute good is not a matter of opinion but of nature.

Our thoughts are free.

Reason should direct and appetite obey.

The man who backbites an absent friend, nay, who does not stand up for him when another blames him, the man who angles for bursts of laughter and for the repute of a wit, who can invent what he never saw, who cannot keep a secret - that man is black at heart mark and avoid him.

Our span of life is brief, but is long enough for us to live well and honestly.