Now, it is shown that every smallest revelation of these to us, is accomplished by some local atomic movement, which, on a scientific instrument fine enough, would leave a distinct impression; and thus it is argued that no force is revealed through matter that is not inseparable from the forms revealing it.

Here we see the meaning of that great modern axiom, that verification is the test of truth; or that we can build on nothing as certain but what we can prove true.

The meaning of the word '_proof_' by itself may perhaps be somewhat hazy; but the meaning that positive science attaches to it is plain enough.

A fact is only proved when the evidence it rests upon leaves us no room for doubt--when it forces on every mind the same invincible conviction; that is, in other words, when, directly or indirectly, its material equivalent can be impressed upon our bodily senses.
This is the fulcrum of the modern intellectual lever.

Ask anyone oppressed and embittered by the want of religion the reason why he does not again embrace it, and the answer will still be this--that there is no proof that it is true.