From personal experience with the Lord, He is very gracious in needed discipline in correcting the course of a wayward Christian. At first, it is small nudges, hints hunches, and the like. If that does not work, He will get your attention, maybe by some type of medium step, maybe by you finding yourself on a hospital bed with a long recovery ahead.
We are always talking about assurance of salvation, or are you really saved. One good way to know is the pattern of getting away from God, because if you are a Christian, He will deal with you, 100% guaranteed. If you know you are living a life worthy of the devil, and nothing happens over an extended period, that is a sure sign that one better repent, believe what Jesus did on the cross, but their faith in Him, and come to salvation.