An Argument is not won by being argumentative — A fire is not extinguished by fire.

Argument is like an arrow from a cross-bow, which has equal force though shot by a child.

Argument is like an arrow from a cross-bow, which has great force though shot by a child.

The Argument is a detestible thing — They are always vulgar, and often convincing.

Doubt is the abettor of tyranny.

Doubt is important to knowledge — He knows not how to know who knows not also how to unknow.

Doubt is important to faith — A faith which does not doubt is a dead faith.

Doubt is healthy — Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right.

Fear is the fire that melts Icarian wings.

Fear is many-eyed.

Fear is the parent of cruelty.

Fear is the mother of superstition.

Habit is the invisible architecture of daily life.

Habit is that into which uncertainty disappears.

Habit is the second nature which destroys the first.

Habit is the ballast that chains the dog to his vomit.