Even though he was brought up in Liberal Christianity, he later became part of the broad Evangelical tradition, and explored Reformed, Arminian and Pentecostal streams of thought.

Feeling our way toward the truth is the nature of theological work even with the help of Scripture, tradition and community .... A pilgrimage, therefore, far from being unusual or slightly dishonorable, is what we would expect theologians who are properly aware of their limitations to experience.

From 1969 to 1974, Pinnock taught at Trinity Evangelical Divinity School, Deerfield, Illinois, and from 1974 to 1977 at Regent College in Vancouver.

In this book, he dealt with issues relating to the Trinity, Christ, the church, union with God, and revelation.

In his book A Wideness in God’s Mercy, Pinnock explored the idea of the destiny of the unevangelized.

Clark Pinnock wrote articles on several other issues, including an annihilationist view of hell.

He faulted the traditional view for grossly distorting the character of God and being based on unbiblical presuppositions.

Upon Pinnock's death, Christianity Today wrote of him that "he was reputed to study carefully, think precisely, argue forcefully, and shift his positions willingly if he discovered a more fruitful pathway of understanding".