The Triune God created all things for His glory. Thus, all creation, including the human mind, serves to exalt God the Father, God the Son, and God the Holy Spirit. In distinct Piper fashion, John Piper in Think reveals the true purpose of the human mind: to know God, love God, and love man through Jesus Christ (21, 154, and 175).
To help readers fulfill the purpose of the mind, Piper walks them through thinking unto the glory of God. He argues thinking is not merely an emotionless endeavor, but the mind serves to know the truth that fuels the fires of the heart (36). Readers however must not be whimsical in their thinking, for they must think carefully, ask questions, and weave the answers into an extensive fabric of understanding that helps them live lives of love to the glory of Jesus Christ (55). Furthermore, thinking is essential to Christianity because there is no way to awaken faith or strengthen faith apart from it (66); however, thinking alone is not enough, for the Holy Spirit must work or true faith cannot be awakened or grown (80).
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Also watch a video of Piper describing what his book is all about: