Act in earnest and you will become earnest in all you do.
Once you accept an idea, it's an idea whose time has come.
To consider hypotheses is surely always better than to dogmatize ins blaue hinein
A great many people think they are thinking when they are merely rearranging their prejudices.
... the intellect, everywhere invasive, shows everywhere its shallowing effect.
With no attempt there can be no failure; with no failure no humiliation.