Commentaries:
Though God is capable of the kind of physical salvation or deliverance that He indicates He will give to His people in Psalm 91, His general advice to His people is to "flee, get out, get away from the trouble." Even though God could protect one in the midst of trouble, He still gives this general advice. David authored Psalm 3 (where he said he felt safe surrounded by ten thousand people) while fleeing. So this in no way denigrates God, and it in no way makes for a "cowardly Christian" when he flees persecution and possibly certain death. We have to understand that God places responsibilities on us. As we take His advice—to flee—He will "open up the mountain" before us, so we can follow the path that He makes clear for us.
John W. Ritenbaugh
A Place of Safety? (Part 1)
Other Forerunner Commentary entries containing Matthew 10:23:
Daniel 8:5-7
Romans 13:1