system into Christian practice. Thus it is not enough to have an intellectual concept of faith and trust in Christ without actually exercising faith and trust in Christ. The believer’s exercising of faith, then, is called the appropriation of faith. (1225–1274). Medieval Italian theologian and monk whose work was declared to be the official teaching of the Roman Catholic Church by Pope Leo XIII in 1879. Aquinas’s greatest influence is found in his *Summa Theologica, a systematic presentation
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