Doubt can only be removed by action.
Progress has not followed a straight ascending line, but a spiral with rhythms of progress and retrogression, of evolution and dissolution.
Nature knows no pause in progress and development, and attaches her curse on all inaction.
He who moves not forward, goes backward.
Someday someone will write a pathology of experimental physics and bring to light all those swindles which subvert our reason, beguile our judgement and, what is worse, stand in the way of any practical progress. The phenomena must be freed once and for all from their grim torture chamber of empiricism, mechanism, and dogmatism; they must be brought before the jury of man's common sense.
The greatest thing in this world is not so much where we stand as in what direction we are moving.
Let mental culture go on advancing, let the natural sciences progress in even greater extent and depth, and the human mind widen itself as much as it desires: beyond the elevation and moral culture of Christianity, as it shines forth in the Gospels, it will not go.
Even though the world as a whole progresses, youth must always start again from the beginning, and as individuals go through the epochs of the world's culture.
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