<p>5:17 <i>All unrighteousness is sin, and there is a sin not unto death</i>- John urges them to accept that although sin is sin, not all sins lead to death; and the reason they don't is because other believers can pray for the sinners, and they shall receive the gift of life, the Spirit, the life of Jesus, to strengthen them (see on :16). The onus upon us to pray for others is huge.</p>