2 Corinthians 9:6

Now (remember) this: he who sows sparingly will also reap sparingly, and he who sows generously (that blessings may come to others) will also reap generously (and be blessed).

Giving is a trust issue with God. Suppose the question is whether we will have enough; we will not give in faith and receive. God is the one who provides for all our needs, and we have to trust Him to do it. We also must be willing givers to receive from God. Our knowledge of God’s works and His giving and receiving system is vital.