In the "The Meaning of Truth", William James says,
Distance ... is made abstract by emptying out whatever is particular in the concrete intervals—it is reduced thus to a sole 'difference,' a difference of 'place', which is a logical ... distinction, a so-called 'pure relation.'
The same is true of the relation called 'knowing,' which may connect an idea with a reality. ... I say that we know an object by means of an idea ..."
Here's a pangrammatical transposition of this passage, converting it from a statement about knowledge to one about power (here, as we shall see, "mastery"):
Duration ... is made concrete by filling in whatever is universal in the abstract termini—it is ramified thus to a mass 'identity,' an identity of 'way', which is a passionate ... equivalence, a so-called 'brute position.'
The same may be said of the position called 'mastering,' which may divorce a reality from an idea. ... I say that we master a subject by means of a reality ..."
Not bad, eh?