Let me ask you a rhetorical question, "Why do you want to 'reciprocate' to God good works instead of doing good works all the time? Isn't this what God really, really would like you to do?
The answer to this question is that we can't as Paul points out. We want to do good but we just can't. We want to obey the golden rule but we only do so piece meal. God expects us to live like Christ-every moment. It isn't so much the charitable works that we do. The problem is in the time we are not charitable.
James 3:11 Does a spring send forth fresh water and bitter from the same opening? 12 Can a fig tree, my brethren, bear olives, or a grapevine bear figs? Thus no spring yields both salt water and fresh. 13 Who is wise and understanding among you? Let him show by good conduct that his works are done in the meekness of wisdom. 14 But if you have bitter envy and self-seeking in your hearts, do not boast and lie against the truth. 15 This wisdom does not descend from above, but is earthly, sensual, demonic. 16 For where envy and self-seeking exist, confusion and every evil thing are there. 17 But the wisdom that is from above is first pure, then peaceable, gentle, willing to yield, full of mercy and good fruits, without partiality and without hypocrisy. 18 Now the fruit of righteousness is sown in peace by those who make peace.
Psalm 1:1 Blessed is the man Who walks not in the counsel of the ungodly, Nor stands in the path of sinners, Nor sits in the seat of the scornful; 2 But his delight is in the law of the Lord, And in His law he meditates day and night. 3 He shall be like a tree Planted by the rivers of water, That brings forth its fruit in its season, Whose leaf also shall not wither; And whatever he does shall prosper. 4 The ungodly are not so, But are like the chaff which the wind drives away. 5 Therefore the ungodly shall not stand in the judgment, Nor sinners in the congregation of the righteous. 6 For the Lord knows the way of the righteous, But the way of the ungodly shall perish.