Progress has not followed a straight ascending line, but a spiral with rhythms of progress and retrogression, of evolution and dissolution.
He who moves not forward, goes backward.
Everybody wants to be somebody; nobody wants to grow.
With the growth of knowledge our ideas must from time to time be organized afresh. The change takes place usually in accordance with new maxims as they arise, but it always remains provisional.
The greatest thing in this world is not so much where we stand as in what direction we are moving.
The close and thoughtful observer more and more learns to recognize his limitations. He realizes that with the steady growth of knowledge more and more new problems keep on emerging.
Happy is it, indeed, for me that my heart is capable of feeling the same simple and innocent pleasure as the peasant whose table is covered with food of his own rearing, and who not only enjoys his meal, but remembers with delight the happy days and sunny mornings when he planted it, the soft evenings when he watered it, and the pleasure he experienced in watching its daily growth.
A mind, once formed, is never suited after, One yet in growth will ever grateful be. [Ger., Wer fertig ist, dem ist nichts recht zu machen, Ein Werdender wird immer dankbar sein.]
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