If God gives to all men life and breath and all things, he acts with reference to each individual man, to each individual breath that each man breathes, and to each particular thing going to make up all the things which he gives them. Again, if God appoints beforehand the "periods" of the nation, (by which I understand all the great eras in their history,) and the "boundaries of their habitations," he certainly directs the movements of individual men; for the movements of the nations depend upon the movements of the individual men of whom they are composed. Sometimes, indeed, the movements of one man, as of Christopher Columbus, determine the settlement of continents, and the destiny of mighty nations. In view of these facts, we must admit the most special and minute providence of God in all the affairs of the earth. It would never, perhaps, have been doubted, but for the philosophical difficulty of reconciling it with the free agency of men, and of discriminating between it and the working of miracles. This difficulty, however, affords no rational ground for such a doubt, for the method of God's agency in human affairs is above human comprehension. To doubt the reality of an assured fact, the nature of which is confessedly above our comprehension, because we know not how to reconcile it with other known facts, is equivalent to confessing our ignorance at one moment, and denying it the next.
J.W. McGarvey's Original Commentary on Acts [pp. 221 -- pertaining to Acts 17:22ff]