The reason many believers are not significant givers is because they have never been significant receivers. They have never fully accepted God’s extraordinary flow of unconditional love that constantly pours over them. Until you fully receive God’s unconditional love, you will never be passionately motivated to love Him back.
The Bible repeatedly admonishes us to trust in the Lord. For example, we are told to trust in the Lord with all your heart and do not lean on your own understanding (Proverbs 3:5, NASB). However, because of our fallen and selfish nature, we are inclined to put our trust in anything or anyone but the Lord.