How does Russell's definition of knowledge differ from what is commonly understood by the term?

Knowledge is a treasure and Russell was a seeker of it. He craved to know and understood the Pythagorean power by which a number holds sway over the flux. He was a much learned man. He did believe that he achieved a little of it as well and yet he yearned for more. The understanding of the higher subjects, why the stars shine? He beseeched beyond all this and it in turn took him upward toward the heavens.