John Calvin Commentary Isaiah 65:10

"And Sharon shall be a fold of flocks, and the valley of Achor a place for herds to lie down in, for my people that have sought me." — Isaiah 65:10 (ASV)

And Sharon shall be an abode of flocks. By these figures he means nothing other than that the land, which was a desert, will be inhabited again, for there is an implied comparison. Although, as a consequence of its inhabitants' banishment to a distant country, the land will be forsaken and desolate, it will eventually be inhabited again, so that it abounds in flocks and herds, has fertile lands suitable for pasture, and abundantly supplies everything necessary for human food and support. Sharon was a place suited for pasture, as was Achor; but the former was suited for flocks, and the latter for herds.

Here we see that God's promises contain blessings not only for the future life but also for the present life, so that we may increasingly taste His bounty and kindness. For by these present blessings we are invited to the greater and more excellent blessings of the heavenly life. When the Lord extends His bounty to flocks and herds, this ought to confirm us further and make us more certain of His fatherly care for us. For if He pays attention to flocks, which were created for our sake, He will much more supply us with all that is necessary for the life that now is, and for that which is to come (1 Timothy 4:8).

Yet we must also keep in view the spiritual meaning (of which we have spoken previously) that leads us from God’s earthly blessings to Christ’s spiritual kingdom, which the prophets foreshadow using that image.

For my people. Here he also excludes the reprobate, who were not ashamed of boasting vainly and falsely in God's name. Although they confidently boast of promises and sacraments, they have nothing in common with the children; and, having been excluded from all hope of God’s favors, they receive the reward of their iniquity. By adding, Who have sought me, he describes more plainly who those are who will share in these benefits, so that, as has already been said, he may entirely cut off reprobates and hypocrites. The sure mark by which lambs are distinguished from goats, and legitimate children from illegitimate ones, is to seek the Lord. For it is not enough to shelter ourselves under a name and title, but we must seek the Lord with a pure conscience, that we may cling to Him with our whole heart (Deuteronomy 6:5).