Pivotal figure in Christian theology and philosophy
His works, such as "Confessions" and "City of God," profoundly influenced Western Christianity
Developed key doctrines like original sin, divine grace, and the nature of the Church
Argued that all humans inherit a sinful nature due to the disobedience of Adam and Eve in the Garden of Eden, and that this inherent sinfulness distorts human will and leads to moral weakness, making salvation possible only through divine grace
Taught that grace was freely given by God, unmerited by human actions, and was essential for enabling individuals to have faith and to live virtuously
Viewed the Church as the mystical body of Christ, comprising both the earthly community of believers and the heavenly assembly of saints, and emphasized the importance of unity and obedience within the Church as essential for salvation
His writings shaped both Catholic and Protestant theology and continue to be highly influential in Christian thought