Notice carefully the comparisons Micah uses to illustrate the value of humility in God's eyes, especially the ascending value of each illustration. Calves for sacrifices are in the plural, indicating more than one sacrifice at a time when even one calf would have been an offering of considerable monetary value. A thousand rams might be what a king would offer. Obviously, so many rams are a very valuable gift, but we should already be asking ourselves, "Is this the right way to impress God?" Ten thousand rivers of olive oil would equal the value of the offerings of many kings of many nations. Does that meet the standard God sets? One's own firstborn is without doubt the most precious gift of all. Yet, again, the implication is that this is not what God wants.
What follows is one of the truly great statements in the entire Bible. Micah names three great acts of love for God and fellow man that pave the way for a good relationship with Him: 1) To be righteous and absolutely fair to all regardless of their status in life. 2) To show kindness freely and willingly to others. 3) To live humbly in conscious fellowship of the greatness and sovereignty of God. These three actions will work to glorify God so that He enables those acting thus to neutralize their pride.
Our service to God should not be given to Him with the primary purpose to "get" things selfishly from Him. Our purpose should always be to honor and glorify Him through what He is doing in our lives. Nevertheless, God is most certainly not against providing us with wonderful gifts as we humbly submit to Him with pure motives.
John W. Ritenbaugh
Living by Faith and Humility