To begin with, our knowledge grows in spots. The spots may be large or small, but the knowledge never grows all over: some old knowledge always remains what it was. Your knowledge of pragmatism, let us suppose, is growing now. Later, it’s growth may involve considerable modification of opinions which you previously held to be true. But such modifications are apt to be gradual.
Pg 73, Pragmatism – William James, ISBN 978-0-7607-4996-8