None of us are ever who we were yesterday. - William James

Conversion is in its essence a normal adolescent phenomenon, incidental to the passage from the child's small universe to the wider intellectual and spiritual life of maturity.

...do every day or two something for no other reason that you would rather not do it, so that when the hour of dire need draws nigh, it may find you not unnerved and untrained to stand the test.

Whilst part of what we perceive comes through our senses from the object before us, another part (and it may be the larger part) always comes out of our own mind.