Authors:

It is with words as with sunbeams - the more they are condensed, the deeper they burn.

"A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern" ed. by Tryon Edwards, F. B. Dickerson Company, (p. 52), 1908.
It is with words as with sunbeams - the more they are condensed, the deeper they burn.