Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.
The Jews would not willingly tread upon the smallest piece of paper in their way, but took it up; for possibly, they say, the name of God may be on it. Though there was a little superstition in this, yet truly there is nothing but good religion in it, if we apply it to men. Trample not on any; there may be some work of grace there, that thou knowest not of. The name of God may be written upon that soul thou treadest on; it may be a soul that Christ thought so much of, as to give His precious blood for it; therefore despise it not.
Everything is worth it. The hard work, the times when you're tired, the times where you're a bit sad... In the end, it's all worth it because it really makes me happy. There's nothing better than loving what you do.
Those people who develop the ability to continuously acquire new and better forms of knowledge that they can apply to their work and to their lives will be the movers and shakers in our society for the indefinite future.