Spend your enthusiasm freely and be surprised at how it thrives on usage.
Enthusiasm being produced by energy must of a necessity depend largely upon that.

Now the point is, how shall we guard and keep fresh this element in ourselves?
We know that the body is producing this quality.
Like the steam engine we are keeping the fires going by exercise, wholesome thinking and sincerity of purpose.

We are the engineers.

Our hand is on the throttle.

Sharp turns lie ahead but our eyes look forward fearlessly.