When there's no experimenting there's no progress. Stop experimenting and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble.

The First 40 hours of work per week are for survival. Everything after that is for success.

It is astonishing what an effort it seems to be for many people to put their brains definitely and systematically to work.

How is freedom measured, in individuals as in nations? By the resistance which must be overcome, by the effort [Mühe] it costs to remain on top.

When one has a great deal to put into it a day has a hundred pockets.

On the mountains of truth you can never climb in vain: either you will reach a point higher up today, or you will be training your powers so that you will be able to climb higher tomorrow.