Pelagianism is the teaching that people have the capacity to seek God in and of themselves apart from any movement of God or the Holy Spirit, and therefore that salvation is effected by their own efforts. The doctrine takes its name from Pelagius, a British monk who was accused of developing the doctrine (he himself appears to have claimed in his letters that man does not do good apart from grace, claiming only that all men have free will by God's gift); it was opposed especially by Augustine of Hippo and was declared a heresy by Pope Zosimus in 418. Rejecting the existence of original sin, it teaches that man is in himself and by nature capable of choosing good.[13]