According to the Bible - How to deal with doubts of salvation

Doubts, fears, turmoil, temptations, and sin will always haunt our minds and cause us grief. But we were told that this would always happen while we are in the flesh, and this is why we are also told to abide in Christ, His word to abide in us, to walk in the spirit, live in the spirit, and to keep our minds upon the Lord always. He keeps us, He holds us, He saves us, He is able - because we are not. It's about His grace, not us. It's about His keeping us despite our inabilities, because He loves us enough to hold us by unmerited grace, and He loves us enough to say for us to rest in Him and fear not, worry not, doubt not, fret not. So when the fears of life and self overwhelm, run to Christ and e still and know that He is God and that He is able while we are not.