The strong emotions surrounding the abortion issue may lead those on both sides of the issue into the sin of self-righteousness. Jesus was greatly offended by self-righteous religious people who thought they were better than those they considered "sinners."
The Pharisees were a Jewish sect noted for their strict observance of the laws of God. Tax collectors were among the most despised people in Israel. As agents of the occupying Roman forces they often extorted excess taxes and were considered traitors to their people. That is why Jesus used a Pharisee and a tax collector to illustrate the sin of self-righteousness:
Then [Jesus] told this story to some who boasted of their virtue and scorned everyone else: "Two men went to the Temple to pray. One was a proud, self-righteous Pharisee, and the other a cheating tax collector. The proud Pharisee 'prayed' this prayer: 'Thank God, I am not a sinner like everyone else, especially like that tax collector over there! For I never cheat, I don't commit adultery, I go without food twice a week, and I give to God a tenth of everything I earn.' "But the corrupt tax collector stood at a distance and dared not even lift his eyes to heaven as he prayed, but beat upon his chest in sorrow, exclaiming, 'God, be merciful to me, a sinner.' I tell you, this sinner, not the Pharisee, returned home forgiven! For the proud shall be humbled, but the humble shall be honored." (TLB, Luke 18:9-14)
Further, Jesus told us to eliminate the sins in our own lives rather than passing judgment or looking down on others. For if we judge other people harshly, we will, in turn, be judged harshly by God:
"Do not judge, or you too will be judged. For in the same way you judge others, you will be judged, and with the measure you use, it will be measured to you. (NIV, Matthew 7:1-2)
Christians have a responsibility to correct matters of wrongdoing among themselves (Matthew 18:15-17), but this should always be done fairly and with compassion. We are never to take upon ourselves the task of judgment that belongs to God alone (Hebrews 10:30, Romans 14:10-13, 1 Corinthians 4:5.)
As Christians, we need to remember that we are all sinners in God's eyes (Romans 3:23), and that God loves all His children, even those who believe differently than we do (Matthew 5:43-48). We cannot afford to let our strong feelings on abortion issues blind us to Jesus' commandment to "Love your neighbor as yourself" (Matthew 22:36-39).
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