Suppose we have a motor and our transmission doesn’t work or our clutch or whatever. Then our body, our motor, just takes us down the road. Or our brakes don’t work! We must have a coordination system.
Discipline, strictly speaking, is activity carried on to prepare us indirectly for some activity other than itself. We do not practice the piano to practice the piano well, but to play it well.
Bodily pleasure is not in itself a bad thing. But when it is exalted to a necessity and we become dependent upon it, then we are slaves of our body and its feelings. Only misery lies ahead.
The open secret of many Bible believing Churches is that a vanishingly small percentage of those talking about prayer and Bible reading are actually doing what they are talking about.
Grace is not opposed to effort, it is opposed to earning. Earning is an attitude. Effort is an action. Grace, you know, does not just have to do with forgiveness of sins alone.