"Relativity" of knowledge is opposed to absoluteness or positiveness of knowledge.
God reveals Himself in the logical idea, in nature and in mind; but mind is not alike conscious of its absoluteness in every stage of development.
Thus scepticism and relativism are superseded by a historical philosophy, and the absoluteness of truth is affirmed, but the notion of a definite truth is at the same time both negated and satirized.
And how is this impersonality or absoluteness of the conditions of knowledge to be established ?
Hedonistic psychology denied the libertarian hypothesis, but it denied also the absoluteness and intuitive character of moral obligation, and attached no validity to the ordinary interpretation of terms like "ought" and duty.