2 Corinthians 9:8

Such giving need not produce anxiety in the giver even if he or she is giving away much. God demonstrates His love for cheerful givers by giving them more grace and more opportunity. He also makes us contented (Gr. autarkeia), sufficient in that sense (cf. Philippians 4:11; 1 Timothy 6:6). However, we always need to remember that God is the One from whom everything we have comes.

Notice the "able" in this verse. This should not lead to the conclusion that God can, but He may not (cf. 2 Corinthians 12:9). The righteous person who desires to give to the needs of others will not lack opportunity to do so because God will make this possible for him or her.