"If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down".

I do not attack Moses,

The pancreas is by far the most complex organ in the body.

A man who dares to waste one hour of life has not discovered the value of life

Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such fine graduated organic chain; and this, perhaps, is the most obvious and serious objection which can be urged against the theory.

It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.