"The doctrines of the Trinity and predestination (or God's decree) converge at the point of the eternal covenant of redemption (pactum salutis) between the persons of the Godhead. In that covenant, before the world existed, the Father, the Son, and the Spirit already turn toward us, with a purpose to create, redeem, and gather a church for everlasting fellowship. As in all of God's external operations, both the eternal decree itself and its execution in history are accomplished from the Father, in the Son, and through the Spirit." The Christian Faith 309
"Furthermore, biblical revelation identifies each of these persons as a thinking, willing, and active agent. Nothing exhibits this fact more than the covenant of redemption (pactum salutis) made between the divine persons in eternity, which is presupposed in the way that Jesus speaks (especially in John's Gospel) of his having been given a people by the Father who are and will be united to him by the Spirit after his departure." (303)
"The persons of the Godhead mutually committed themselves to Golgotha from all of eternity in the covenant of redemption." 510
"In the eternal councils of the Trinity (the covenant of redemption), the Father elected a certain number of the human race and gave them to his Son as their guardian and mediator, with the Spirit pledging to bring them to Christ to receive all the benefits of his mediation." (518)
"The Holy Spirit brings the elect, through the hearing of the gospel, to faith; in doing so, the Spirit engrafts them into Christ." - Dennis Tamburello (The Christian Faith 575)
"The Spirit has voluntarily bound himself in his activity to the Word spoken by the Father in the Son." 575