And all our knowledge is ourselves to know.

Essay on Man. Epistle iv. Line 397.

To observations which ourselves we make,

We grow more partial for th' observer's sake.

Moral Essays. Epistle i. Line 11.

Like following life through creatures you dissect,

You lose it in the moment you detect.

Moral Essays. Epistle i. Line 20.

In vain sedate reflections we would make

When half our knowledge we must snatch, not take.