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- If an organised body is not in the situation and circumstances best adapted to its sustenance and propagation, then, in conceiving an indefinite variety among the individuals of that species, we must be assured, that, on the one hand, those which depart most from the best adapted constitution, will be most liable to perish, while, on the other hand, those organised bodies, which most approach to the best constitution for the present circumstances, will be best adapted to continue, in preserving themselves and multiplying the individuals of their race.
- The past history of our globe must be explained by what can be seen to be happening now. No powers are to be employed that are not natural to the globe, no action to be admitted except those of which we know the principle.
- Source: Theory of the Earth (Paper, published in Transactions of the Royal Society of Edinburgh in 1785)
- We find no vestige of a beginning - no prospect of an end.
- Theory of the Earth (1795)
- What more can we require? Nothing but time.