Monergism

"If God has laid your sins upon the Son of His love, you may rest assured that He will never lay them a second time upon you; since, if Christ has borne them and atoned for them to Divine justice, they never again can be found." - Octavius Winslow

The Grounds of Assurance - How Can We Be Sure?
Adapted from John Frame's Salvation Belongs to the Lord

1. The “divine truth of the promises of salvation” (Jn. 1:12; 3:15-16, 36; 5:24; 6:35, 40, 47). Justification comes from faith, trusting in God’s promises. If you believe God’s promises, that is, if you believe in Jesus Christ, you have a right to assurance (Acts 16:31; Rom. 4:3, 20-21; 10:9; Gal. 3:7-9; Heb. 3:14; 6:12).

2. The “inward evidence of those graces unto which these promises are made.” Progressive sanctification is the inseparable evidence (or fruit) of definitive sanctification and must be proved by a balanced combination self-examination and communal-examination (1 Cor. 11:28; 2 Cor. 13:5; 1 Jn. 1:6; 2:3, 29; 3:6-10, 24; 4:7; 5:1, 18).

3. The “testimony of the Spirit to our adoption witnessing with our spirits that we are children of God” (Rom. 8:16-17).