J.I. Packer: The Five Points of Calvinism

(1) Fallen man in his natural state lacks all power to believe the gospel, just as he lacks all power to believe the law, despite all external inducements that may be extended to him. (2) God’s election is a free, sovereign, unconditional choice of sinners, as sinners, to be redeemed by Christ, given faith, and brought to glory. (3) The redeeming work of Christ had as its end and goal the salvation of the elect. (4) The work of the Holy Spirit in bringing men to faith never fails to achieve its object. (5) Believers are kept in faith and grace by the unconquerable power of God till they come to glory. These five points are conveniently denoted by the mnemonic TULIP: Total depravity, Unconditional election, Limited atonement, Irresistible grace, Preservation of the saints.

—J.I. Packer
A Quest For Godliness: The Puritan Vision of the Christian Life