Render then the things that are Caesar's to Caesar and the things that are God's to God. Matthew 22:21
Caesar's : This is to pay tribute to Caesar according to his governmental regulations God's: This is to pay the half-shekel to God according to Exo. 30:11-16, and to offer all the tithes to God according to the law of God.(http://online.recoveryversion.org/FootNotes.asp?FNtsID=839)
To render to Caesar what belongs to Caesar is to pay tribute to the Government according to the Government regulation. This to be righteous before man. To render to God what belongs to God is to offer to God. In the old testament, it was the tithe, but today in the new testament, is as much as the Lord bless and according to our cheerful and willing heart of offering (2 Corintians 9:7 Each one as he has purposed in his heart, not out of sorrow or out of necessity, for God loves a cheerful giver). This is to be righteous before God.
The two givings are equally important. One cannot be neglected on the basis of the other. They are like two sides of a coin. One without the other is invalid. A proper Christian will be balanced and will fulfill his righteous duty before God and man. One cannot claim spirituality by focusing on the "God's" and neglecting the "Caesar's." A truly spiritual and proper God-man will righteously take care of both, acknowledging he is still human living under the human Government though he truly has the divine nature under the ruling of God.
Romans 13:
6 For because of this you also pay taxes; for they are God's officers, attending constantly to this very thing.
7 Render to all the things due: tax to whom tax is due, custom to whom custom is due, fear to whom fear is due, honor to whom honor is due.
This reminds me of my rightful duty to the Government of India as a citizen of India that I must faithfully and righteously file my IT return on time as any other citizen. I rejoice to do this, and I am glad God grace me and bless me enough to be able to do this. Any suggestive thought or advice or presumptuous negligence otherwise will be sinful. Its an indirect "gentlemanly" way of robbing the Government.
The Bible, the Word of God, is so clear and balanced about human affairs, and truly it is the living Word of God. Every word in the Bible is for the welfare not only of spiritual, but even of social and national. Even the Lord Jesus Christ was truly God, yet incarnated as a genuine man with flesh and blood, living an ordinary human life, a proper and perfect man, yet a complete God, the God-man. We, Christians are His brothers, and we are the same as He in life and nature, but not in the Godhead. Jesus had set a pattern for all of us to follow, not in a way of outward imitation but by the very divine life of Him who is in us. May the Lord grace every one to be a proper Christian, a proper God-man and righteously rendering Caesar's to Caesar and God's to God.