Why did Jesus say more about money than He did heaven and hell combined? Our love for money and possessions will always be in top competition with our love for Jesus (Matthew 6:24).
Why should we give? We, who are His children, should be the most generous people on earth (Proverbs 21:26b and Acts 20:35).
Why do we give? Our giving allows us to demonstrate our love and devotion to Jesus. It also demonstrates our faith in Him to provide us with enough to meet our needs (Malachi 3:10-12, Matthew 6:25-34, Luke 6:38, and 2 Corinthians 9:6-8).