Psalms 118:9 - Albert Barnes' Notes on the Bible

It is better ... than to put confidence in princes - Even in the most mighty of the human race; in those who of all people may be supposed to have the most ability to aid us; in those whose favor is often sought more than the favor of God. Princes are only men; often as faithless and deceitful as other men; often less reliable in their character than those in more humble life. and in the great matters where we most need aid - in sickness, in danger, in death, in the eternal world - as absolutely powerless as men in the lowest condition of poverty, or in the most humble rank.