Nothing great was ever achieved without enthusiasm.

Nothing great was ever achieved without enthusiasm.

Enthusiasm is everything. It must be taut and vibrating like a guitar string.

Enthusiasm is everything. It must be taut and vibrating like a guitar string.

Every production of genius must be the production of enthusiasm.

Every production of genius must be the production of enthusiasm.

Enthusiasm is the mother of effort, and without it nothing great was ever achieved.

Enthusiasm is the mother of effort, and without it nothing great was ever achieved.

Earnestness is enthusiasm tempered by reason.

Earnestness is enthusiasm tempered by reason.

In things pertaining to enthusiasm, no man is sane who does not know how to be insane on proper occasions.

In things pertaining to enthusiasm, no man is sane who does not know how to be insane on proper occasions.

I prefer the folly of enthusiasm to the indifference of wisdom.

I prefer the folly of enthusiasm to the indifference of wisdom.

Enthusiasm is the leaping lightning, not to be measured by the horse- power of the understanding.

Enthusiasm is the leaping lightning, not to be measured by the horse- power of the understanding.

Knowledge is power, but enthusiasm pulls the switch.

Knowledge is power, but enthusiasm pulls the switch.