The Psychology of Faith

Chapter 3 begins with how the Donatist controversy shaped Augustine’s theology of justification by faith because the Donatists represented the real possibility of having faith without charity. The chapter then turns to the key features of Augustine’s theology of justification formed by the Pelagian controversy, especially participation in Christ’s righteousness. Both controversies pressed Augustine to consider how justification is by faith if faith sometimes fails to justify, as in Donatists, lax catechumens, and impenitent Christians. In both de spiritu et littera ( The Spirit and the Letter ) and his sermons, Augustine addresses this through a deeper psychology of faith: faith only obtains the grace of justification when it is motivated by hope and fails if it is motivated primarily by fear. The chapter concludes with de fide et operibus ( Faith and Works ), exploring Augustine’s understanding of faith, works, and charity, his criticism of sola fide (faith alone), and his development of a new terminology for justifying faith: fides Christi (faith in Christ).