vital force

Perhaps he had waited too long for the simple breakfast; perhaps the recent glory had drained him of vital force.

What worth have forests or mines or any material wealth, gained at the sacrifice of so much vital force?

Is it not manifest, that while the demands upon the vital force have been increased, the supply of material has been decreased?

Who does not know the man who masters life and becomes a vital force, while his wife remains dull and empty?

I took childish pleasure in watching my Indian boyhood go, and vital force mounting every hour.