“In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.” — Ephesians 1:12-14
Salvation involves the redemption of the whole man, and is applied to all who repent of their sins and believe in Jesus Christ as Lord and Savior, who by His own blood obtained eternal redemption for the believer. In its broadest sense salvation includes regeneration, justification, sanctification, and glorification. There is no salvation apart from personal faith in Jesus Christ as Lord.
Regeneration
Regeneration, or the new birth, is a work of God's grace whereby believers become new creatures in Christ Jesus. It is a change of heart wrought by the Holy Spirit through conviction of sin, to which the sinner responds in repentance toward God and faith in the Lord Jesus Christ. Repentance and faith are inseparable experiences of grace. Repentance is a genuine turning from sin toward God. Faith is the acceptance of Jesus Christ and commitment of the entire personality to Him as Lord and Savior.
Justification
Justification is God's gracious and full acquittal upon principles of His righteousness of all sinners who repent and believe in Christ. It includes the pardon of sin and the promise of eternal life, which are not bestowed because of any righteous works which the believer has done but solely through faith by which Christ’s perfect righteousness is freely imputed to the believer by God. Justification brings the believer into a relationship of peace and favor with God.
Sanctification
Sanctification is the experience, beginning in regeneration, by which the believer is set apart to God's purposes, and is enabled to progress toward moral and spiritual maturity through the presence and power of the Holy Spirit dwelling in him. Growth in grace should continue throughout the regenerate person's life.
Glorification
Glorification is the culmination of salvation and is the final blessed and abiding state of the redeemed. At the point of glorification, being achieved only after this life, the believer will be perfectly righteous, like his Lord. Thus, he will dwell with his Creator and Lord for all eternity.