The man who does not shrink from self-crucifixion can never fail to accomplish the object upon which his heart is set. This is as true of earthly as heavenly things. Even the man whose sole object is to acquire wealth must be prepared to make great personal sacrifices before he can accomplish his object. And how must more so he who would realize a strong and well-poised life? - James Allen quote from "As a Man Thinkest"
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I scientific terms this would be something like "in order to do work, one must expend energy."
In scientific terms w=e(t)