Hume and Experience Again

"For me it seems evident, that the essence of the mind being equally unknown to us with that of external bodies, it must be equally impossible to form any notion of its powers and qualities otherwise than from careful and exact experiments, and the observation of those particular effects, which result from its different circumstances and situations. And tho' we must endeavor to render all our principles as universal as possible, by tracing up our experiments to the utmost and explaining all effects from the simplest and fewest causes, 'tis still certain that we cannot go beyond experience; and any hypothesis, that pretends to discover the ultimate original qualities of human nature, ought at first to be rejected as presumptuous and chimerical." (Hume, Treatise of Human Nature, xxi)