Matthew Henry Commentary Isaiah 51:1-3

"Hearken to me, ye that follow after righteousness, ye that seek Jehovah: look unto the rock whence ye were hewn, and to the hold of the pit whence ye were digged. Look unto Abraham your father, and unto Sarah that bare you; for when he was but one I called him, and I blessed him, and made him many. For Jehovah hath comforted Zion; he hath comforted all her waste places, and hath made her wilderness like Eden, and her desert like the garden of Jehovah; joy and gladness shall be found therein, thanksgiving, and the voice of melody." — Isaiah 51:1-3 (ASV)

It is good for those privileged by the new birth, to consider that they were shapen in sin. This should cause low thoughts of ourselves, and high thoughts of Divine grace.

It is the greatest comfort to be made serviceable to the glory of God. The more holiness people have, and the more good they do, the more gladness they have.

Let us seriously reflect upon our guilt. To do so will tend to keep the heart humble, and the conscience awake and tender. These make Christ more precious to the soul, and give strength to our attempts and prayers for others.