John Calvin Commentary Psalms 74:17

"Thou hast set all the borders of the earth: Thou hast made summer and winter." — Psalms 74:17 (ASV)

Thou hast fixed all the boundaries of the earth. What is stated here concerning the boundaries or limits assigned to the earth, and concerning the regular and successive recurrence of summer and winter each year, has the same meaning as the preceding verse. It is doubtful whether the prophet means the utmost ends of the world, or whether he speaks of the particular boundaries by which countries are separated from each other.

Although the latter are often disturbed by the violence of men, whose insatiable cupidity and ambition cannot be restrained by any of the lines of demarcation which exist in the world, but are always endeavoring to break through them; yet God manifests His singular goodness in assigning to each nation its own territory on which to live.

I am, however, rather of the opinion that the clause is to be understood as referring to those bounds which cannot be confounded by the will of men, and I consider the meaning to be that God has allotted to men as much space of earth as He has seen to be sufficient for them to live on.

Furthermore, the well-regulated successions of summer and winter clearly indicate with what care and kindness God has provided for the necessities of the human family. From this, the prophet justly concludes that nothing is more improbable than that God should neglect to act as a father towards His own flock and household.