“Human will-power alone is not enough. Will-power is excellent and we should always be using it; but it is not enough. A desire to live a good life is not enough. Obviously we should all have that desire, but it will not guarantee success. So let me put it thus: Hold on to your principles of morality and ethics, use your willpower to the limit, pay great heed to every noble, uplifting desire that is in you; but realize that these things alone are not enough, that they will never bring you to the desired place. We have to realize that all our best is totally inadequate, that a spiritual battle must be fought in a spiritual manner.”

– Martyn Lloyd-Jones