We have no clear ideas of the agency of [demonic] spirits, nor is it necessary. The Scripture says little to satisfy our curiosity; but tells us plainly that he is always watching us, and desiring to sift us as wheat. I believe we give him no more than his due, when we charge him with having a hand in all our sins. I believe he cuts us all out abundance of work.
John NewtonAssurance grows by repeated conflict, by our repeated experimental proof of the Lord's power and goodness to save; when we have been brought very low and helped, sorely wounded and healed, cast down and raised again, have given up all hope, and been suddenly snatched from danger, and placed in safety; and when these things have been repeated to us and in us a thousand times over, we begin to learn to trust simply to the word and power of God, beyond and against appearances: and this trust, when habitual and strong, bears the name of assurance; for even assurance has degrees.
John NewtonOf all people who engage in controversy, we, who are called Calvinists, are most expressly bound by our own principles to the exercise of gentleness and moderation.
John Newton