Luke 1:80

The future preacher of repentance, that he might the more boldly reclaim his hearers from the allurements of the world, passes the first part of his life in the deserts. Hence it is said, And the child grew.

But the child grew and became strong in spirit, and he was in the deserts till the day of his showing to Israel. It is appropriate and just that he who is to be a future preacher of repentance follows the harshness of solitude; and …

i. e. in bodily stature, and waxed strong in spirit, for together with his body at the same time his spiritual gift increased, and the workings of the Spirit were more and more manifested in him. Or, he was in the deserts that he might be brought up beyond the reach of the malice of the multitude, and not be afraid of man. For if he had been in the world, perchance he had been corrupted by the friendship and conversation of the world. And secondly, that he who was to preach Christ might also be esteemed trust-worthy. But he was hid in the desert until it pleased God to show him forth to the people of Israel, as it follows, till the day of his showing forth to Israel.

The child "grew" in body and "became strong in spirit," for with the body the spiritual gift also grew; and the more the child grew, the more the powers of the spirit were manifested, since the instrument (the body) was capable of containing them. Why …

And the child grew, and waxed strong in spirit,....

Note, Though it is not the foundation of our faith, yet it is a support to it, that the articles of our creed are things that have been long most surely believed. The doctrine of Christ is what thousands of the wisest and best of men have ventured their souls upon with the greatest assurance and satisfaction.

The child grew - Increased in stature and bodily vigor. And waxed strong in spirit - had his understanding Divinely illuminated and confirmed in the truths of God. And was in the deserts - the city of Hebron, the circumjacent hill country, and in or near Nazareth. Till the time of his showing, or manifestation - till he was thirty years of age, before which time the law did not permit a man to enter into the public ministry, Num 4:3. See also Luk 3:

Another hymn of praise demands our attention in these verses. We have read the thanksgiving of Mary — the mother of our Lord. Let us now read the thanksgiving of Zachariah — the father of John the Baptist. We have heard what praises the first coming of Christ drew from the Virgin of the house of David. Let us now hear what praise it draws from an aged priest. We should notice, firstly — the deep thankfulness of a Jewish believer's heart, in the prospect of Messiah's appearing.

Another hymn of praise demands our attention in these verses. We have read the thanksgiving of Mary — the mother of our Lord. Let us now read the thanksgiving of Zachariah — the father of John the Baptist. We have heard what praises the first coming of Christ drew from the Virgin of the house of David. Let us now hear what praise it draws from an aged priest. We should notice, firstly — the deep thankfulness of a Jewish believer's heart, in the prospect of Messiah's appearing. Praise is the first word that falls from the mouth of Zachariah as soon as his speechlessness is removed, and his tongue restored. He begins with the same expression with which Paul begins several of his epistles, "Blessed be the Lord!" At this period of the world, we can hardly understand the depth of this godly man's feelings. We must imagine ourselves in his position. We must imagine ourselves seeing the fulfillment of the oldest promise in the Old Testament — the promise of a Savior, and beholding the accomplishment of this promise brought near to our own door! We must try to realize what a dim and imperfect view men had of the Gospel — before Christ actually appeared, and the shadows and types passed away. Then perhaps we may have some idea of the feelings of Zachariah when he cried out, "Blessed be the Lord!" It may be feared that Christians have very low and inadequate conceptions of their amazing privileges, in living under the full light of the Gospel. We have probably a very faint idea of the comparative dimness and darkness of the Jewish dispensation. We have a very feeble notion of what a church must have been before the incarnation of Christ. Let us open our eyes to the extent of our obligations. Let us learn from the example of Zachariah, to be more thankful.

Waxed strong in spirit - That is, in courage, understanding, and purposes of good, fitting him for his future work. The word “wax” means to “increase, to grow,” from an old Saxon word. In the deserts - In Hebron, and in the hill country where his father resided. He dwelt in obscurity, and was not known publicly by the people. Until the day of his showing - Until he entered on his public ministry, as recorded in Matt. 3 - that is, probably, until he was about 30 years of age. See Luke 3.