Our aim is not merely to make the child understand, and still less to force him to memorize, but so to touch his imagination as to enthuse him to his innermost core.
The secret of good teaching is to regard the child's intelligence as a fertile field in which seeds may be sown, to grow under the heat of flaming imagination.
Imagination does not become great until human beings, given the courage and the strength, use it to create.
We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry.