What is sin?
Evil is inherent in the natural order of this world, but sin is an attitude of conscious rebellion which was brought to this world by those who fell from spiritual light into gross darkness. ~ The Urantia Book, 148:4.6 (1660.5) [2]
“Sin is the conscious, knowing, and deliberate transgression of the divine law, the Father's will. Sin is the measure of unwillingness to be divinely led and spiritually directed.” ~ Jesus, The Urantia Book, 148:4.4 (1660.3) [3]
The possibility of mistaken judgment (evil) becomes sin only when the human will consciously endorses and knowingly embraces a deliberate immoral judgment. ~ The Urantia Book, 3:5.15 (52.1) [4]
It requires a great and noble character, having started out wrong, to turn about and go right. All too often one's own mind tends to justify continuance in the path of error when once it is entered upon. ~ The Urantia Book, 184:2.12 (1981.6) [5]