2 Corinthians 9:7 So let each one give as he purposes in his heart, not grudgingly or of necessity; for God loves a cheerful giver.
Some Christians are like the little girl who sat next to her father one service. He had given her a dollar to put in the offering, and reminded her that God loves a cheerful giver. She began to whisper to the usher when the offering plate came around. Her father wanted to know what was the problem.
The usher told him that his daughter wanted change for the dollar. Her father told her to put the money in, because God loves a cheerful giver. The child’s immediate response was, "But I’d be a lot more cheerful if I had change for a candy bar."
Another problem is spasmodic planting. Some only plant when there is a special appeal, or when they feel like it. The person who consistently plants, will see the desired harvest. Give to God because you want to, not because you have to.