The Lord knew all about Peter. The herald angel was able to give Cornelius exact instructions for finding him. God never forgets a name, never loses an address, never makes a mistake, never has a moment’s hesitation in knowing where we are or what we are doing. There is something immensely comforting in that to God’s saints. He who tracks the journeyings of a hundred billion stars in each of a hundred million galaxies, who knows the path, the history, and the destiny of every speck of dust in cosmic space, knows all about me! In all my comings and goings by land and sea and air, He knows exactly where to find me any time He wants me. He knows how to send people across my path and into my life to fulfill His own inscrutable purposes. Nothing is more interesting in the book of Acts than to see how God keeps track of men. Does He need a man to meet an Ethiopian traveling at high speed away from Jerusalem with a great longing in his soul? He knows where Philip lives. Does He need a man to find blind Saul of Tarsus on the street called Straight? He knows where Ananias lives. Does He need a man to give the gospel to a good but still unregenerate Roman centurion? He knows Peter’s present, temporary address.
John Phillips, Exploring Acts: An Expository Commentary, The John Phillips Commentary Series (Kregel Publications; WORDsearch Corp., 2009), Ac 10:5–6.