Any great increase in the amount of physical or mental work results in a feeling of weariness which is usually sufficient to cause us to return to our habitual amount of expenditure of energy. Our system is, however, wonderful in its capacity to adjust itself to changed demands which come upon it, whether these demands …

When an individual succeeds in tapping his reserve energies, others marvel at the tremendous tasks he accomplishes. They judge in terms of superficial energy, and for such the results would, of course, be impossible, even though many of the admiring spectators could actually equal or excel the deed. Consider for a moment the work achieved …

The modern business man is the true heir of the old magicians. Every thing he touches seems to increase ten or a hundredfold in value and usefulness. All the old methods, old tools, old instruments have yielded to his transforming spell or else been discarded for new and more effective substitutes. In a thousand industries …