John Calvin (1509-1564) comments on Psalm 20:7, "Some trust in chariots and some in horses: but we will remember the name of the LORD our God."
"We see how natural it is to almost all men to be the more courageous and confident the more they possess of riches, power and military forces. The people of God, therefore, here protest that they do not place their hope, as is the usual way with men, in their military forces and warlike apparatus, but only in the aid of God."
[Thanks to John Lofton]
And here is another great Calvin quote: "For earthly princes lay aside all their power when they rise up against God, and are unworthy of being reckoned in the number of mankind. We ought rather utterly to defy than to obey them whenever they are so restive and wish to spoil God of his rights, and, as it were, to seize upon his throne and draw him down from heaven." (Commentary on Daniel).