I disapprove of what you say, but I will defend to the death your right to say it.

• free speech

It is dangerous to be right when the government is wrong.

• government

The art of medicine consists in amusing the patient while nature cures the disease.

• health

Work saves us from three great evils: boredom, vice, and need.

• work

Every man is guilty of all the good he didn't do.

• regret
• service
• guilt

Doubt is not a pleasant state of mind, but certainty is absurd.

• doubt