Summa Theologica

Summa Theologica is the architectural summit of scholastic thought, an unfinished systematic treatment of God, creation, the moral life, and the human person's return to God. Its governing claim is that the ultimate end of every person is beatitudo, perfect happiness found in the beatific vision, the direct contemplation of God that fulfils intellect and will together.

The method is rigorously dialectical, posing questions, weighing objections, and resolving them by fusing Aristotelian philosophy with Christian doctrine. Aquinas grounds all existence in God as the act of being itself, holds that knowing and loving God advance in concert, and argues that grace perfects rather than destroys nature.

Within Christian mysticism it supplies a measured, intellectual counterweight: union as the completion of the whole person, mind and desire alike, rather than ecstatic erasure of the self.