Jesus, in Matthew 22:44, quotes Psalm 110:1: The Lord said to my Lord, Sit at my right hand, until I put your enemies under your feet. John Calvin’s stated the following regarding Jesus’ words.
“The LORD said to my Lord. Here the Holy Spirit puts into the mouth of all the godly a song triumph, that they may boldly defy Satan and all the ungodly, and mock at their rage, when they endeavor to drive Christ from his throne. That they may not hesitate or tremble, when they perceive great emotions produced in the earth, they are commanded to place the holy and inviolable decree of God in opposition to all the exertions of adversaries. The meaning therefore is: whatever may be the madness of men, all that that they shall dare to contrive will be of no avail for destroying the kingdom of Christ, which has been set up, not by the will of men, but by the appointment of God, and therefore is supported by everlasting strength. Whenever this kingdom is violently attacked, let us call to remembrance this revelation from heaven; for undoubtedly this promise was put into the hand of Christ, that every believer may apply it to his own use. But God never changes or deceives, so as to retract what has once gone out of his mouth.
“Sit at my right hand. This phrase is used metaphorically for the second or next rank, which is occupied by God’s deputy. And therefore it signifies, to hold the highest government and power in the name of God, as we know that God has committed his authority to his only-begotten Son, so as to govern his Church by his agency. This mode of expression, therefore, does not denote any particular place, but, on the contrary, embraces heaven and earth under the government of Christ. And God declares that Christ will sit till his enemies be subdued, in order to inform us that his kingdom will remain invincible against every attack; not that, when his enemies have been subdued, he will be deprived of the power which had been granted to him, but that, while the whole multitude of his enemies shall be laid low, his power will remain forever unimpaired. In the meantime, it points out that condition of his kingdom which we perceive in the present day, that we may not be uneasy when we see it attacked on all sides.” –Commentaries, vol. 17, 69-70.