None are so old as those who have outlived enthusiasm.

None are so old as those who have outlived enthusiasm.

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

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

Success is not the result of spontaneous combustion, you must set yourself on fire first.

Success is not the result of spontaneous combustion, you must set yourself on fire first.

Enthusiasm is contagious. Be a carrier.

Enthusiasm is contagious. Be a carrier.

Knowledge is power, but enthusiasm pulls the switch.

Knowledge is power, but enthusiasm pulls the switch.

If you have zest and enthusiasm you attract zest and enthusiasm. Life does give back in kind.

If you have zest and enthusiasm you attract zest and enthusiasm. Life does give back in kind.

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.

Nothing great was ever achieved without enthusiasm.

Nothing great was ever achieved without enthusiasm.