In truth you cannot read too much in Scripture; and what you read you cannot read too carefully, and what you read carefully you cannot understand too well, and what you understand well you cannot teach too well, and what you teach well you cannot live too well.
Martin LutherOriginal sin is in us like our beard. We are shaved today and look clean; tomorrow our beard has grown again, nor does it cease growing while we remain on earth. In like manner original sin cannot be extirpated from us; it springs up in us as long as we live.
Martin Luther