In an article on Bunyan lately published in the "Contemporary Review" - the only article on the subject worth reading on the subject I ever saw (yes, thank you, I am familiar with Macaulay's patronizing prattle about "The Pilgrim's Progress") etc.
The more we progress the more we tend to progress. We advance not in arithmetical but in geometrical progression. We draw compound interest on the whole capital of knowledge and virtue which has been accumulated since the dawning of time.
Truth should be the very breath of our life. When once this state in the pilgrim's progress is reached, all other rules of correct living will come without any effort, and obedience to them will be instinctive.