Hume, David - The Self and Perceptions
Type of Spiritual Experience
A description of the experience
Treatise, Bk. I, Part II, Sect. VI.
We may observe, that it is universally allowed by philosophers, and is besides pretty obvious of itself, that nothing is ever really present with the mind but its perceptions or impressions and ideas, and that external objects become known to us only by those perceptions they occasion. To hate, to love, to think, to feel, to see; all this is nothing but to perceive.