Knowledge is power, but enthusiasm pulls the switch.

Knowledge is power, but enthusiasm pulls the switch.

Enthusiasm is contagious. Be a carrier.

Enthusiasm is contagious. Be a carrier.

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.

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.

Enthusiasm is excitement with inspiration, motivation, and a pinch of creativity.

Enthusiasm is excitement with inspiration, motivation, and a pinch of creativity.

Enthusiasm is the inspiration of everything great. Without it no man is to be feared, and with it none despised.

Enthusiasm is the inspiration of everything great. Without it no man is to be feared, and with it none despised.

None are so old as those who have outlived enthusiasm.

None are so old as those who have outlived enthusiasm.

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.