A quotation by Ruggero Giuseppe Boscovich
Homo hominem arreptum a Tellure, et ubicumque exigua impulsum vi vel une etiam oris flatu impetitum, ab hominum omnium commercio in infinitum expelleret, nunquam per totam aeternitatem rediturum.
Were it not for gravity one man might hurl another by a puff of his breath into the depths of space, beyond recall for all eternity.
It will be found that everything depends on the composition of the forces with which these particles of matter act upon one another: and from these forces, as a matter of fact, all phenomena of Nature take their origin.
Theoria Philosophiae Naturalis