The perseverance of the saints is the doctrine that those whom God has effectively called and justified will, by His sustaining power, certainly continue in a state of grace until the end and attain eternal salvation. While Reformed and Presbyterian traditions ground this security in the immutability of God's decree and the covenant of grace, Particular Baptists similarly maintain that this perseverance does not rest upon the believer's own fluctuating will, but entirely upon the abiding work of the Holy Spirit and the intercession of Christ.
The perseverance of the saints is not a matter of human effort or our own strength, which is prone to failure and fickleness. Instead, as stated in the 1689 LBCF Ch.17 §1, those whom God has accepted in His Beloved can neither totally nor finally fall away from the state of grace. This is because they are kept by the power of God, who nourishes faith, repentance, and love in their hearts unto immortality. We must confess with the Canons of Dort Head 4 Art.3 that if we were left to our own strength, we could not persevere; yet God is faithful to mercifully confirm and powerfully preserve His people to the end.
Our security is not found in our own stability, but in the immutable decree of election and the efficacy of Christ's work. The 1689 LBCF Ch.17 §2 emphasizes that perseverance flows from the unchangeable love of God the Father, the merit and intercession of Jesus Christ, and the abiding of the Holy Spirit. As our Lord Jesus promises in John 10:28, 'and I give unto them eternal life; and they shall never perish, and no one shall snatch them out of my hand.' This is the gospel comfort: because Christ lives, we shall live also, and our salvation is held secure in His hands.