Knowing is not enough; we must apply. Willing is not enough; we must do.
It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.
Painting is easy when you don’t know how, but very difficult when you do.
Knowledge is of no value unless you put it into practice.
I am not young enough to know everything.
There are three principal means of acquiring knowledge. . . observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.
Imagination is more important than knowledge.