Augustine of Hippo
We have a Savior who declares that authority over all humanity has been bestowed upon Him. (John 17:2) Thus, that King began to manifest Himself when it was proclaimed, "To Thee shall all flesh come." He affirms, "To Thee, all flesh shall come." Why will every human being approach Him? Because He took upon Himself our mortal form. To what end will all humanity come? He drew His beginning from the womb of the Virgin; and now that the first fruits have been offered to Him, the remainder will follow to fulfill the sacrificial offering.
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What, then, is the source of all humanity? Every person. And where does every person originate? Has it not been foretold that all will come to believe in Christ? Furthermore, was it not prophesied that many ungodly individuals would face judgment? Do not those who reject faith perish daily in their disbelief? How, then, should we interpret: To Thee shall all flesh come? By "all flesh," He refers to every individual: from every kind of flesh they will draw near to You. What is meant by "from all flesh"? Do only the impoverished come, leaving out the wealthy? Did the humble arrive, while the exalted stayed away? Did the unlearned come, but not the learned? Have men approached, but not women? Have noblemen come while servants did not? Did the elderly arrive, but not the youth; or did the young come, but not the boys; or did the boys come, while infants were not brought? In essence, did the Jews approach (for from whom did the Apostles come, and many thousands who first turned away and later believed, as we see in Acts 2:41), and did the Greeks not come; or did the Greeks come, but not the Romans; or did the Romans come, while the barbarians remained distant? Who could enumerate all the nations that draw near to Him, to whom it is said, "To Thee shall all flesh come"?