John Calvin Commentary Psalms 46:5

"God is in the midst of her; she shall not be moved: God will help her, and that right early." — Psalms 46:5 (ASV)

God is in the midst of her; she shall not be moved. The Psalmist now shows that the great security of the Church consists in this: that God dwells in the midst of her. For the verb which we translate, shall be moved, is of the feminine gender, nor can it be referred to God, as if it were designed to teach that God is immovable.

The sentence must be explained in this way: The holy city shall not be moved or shaken because God dwells there and is always ready to help her. The expression, the dawn of the morning, denotes daily, as soon as the sun rises upon the earth. The sum of the whole is this: If we desire to be protected by the hand of God, we must be concerned above all things that He may dwell among us, for all hope of safety depends upon His presence alone.

And He dwells among us for no other purpose than to preserve us uninjured. Moreover, although God does not always hasten immediately to our aid according to the urgency of our desires, yet He will always come to us at the right time, so as to make apparent the truth of what is said elsewhere:

Behold, He that keeps Israel shall neither slumber nor sleep (Psalms 121:4).