Charles H. Spurgeon on Psalms 66:6

There did we rejoice in him; where those things have been done, there have we rejoiced in him, not taking any credit to ourselves as if they were our acts, but rejoicing and glorying in God, and have praised him, as may be seen in Exodus 15 and Joshua 3. The prophet uses the future for the past, unless, perhaps, he meant to insinuate that these miracles would be succeeded by much greater ones, of which they were only the types and figures. A much greater miracle is that men should pass over the bitter sea of this life, and cross the river of mortality, that never ceases to run, and which swallows up and drowns so many, and still come safe and alive to the land of eternal promise, and there rejoice in God himself, beholding him face to face; and yet this greater miracle is so accomplished by God, that many pass through this sea as if it were dry land, and cross this river with dry feet; that is to say, having no difficulty in despising all things temporal, be they good or be they bad; that is to say, being neither attached to the good things, nor fearing the evil things, of this world, that they may arrive in security at the heavenly Jerusalem, where we will rejoice in him, not in hope, but in complete possession for eternity. Robert Bellarmine.