i picked this commentator at random i give you a background on his education
Albert Barnes (1798-1870) was an American theologian, born at Rome, New York, on December 1, 1798. He graduated from Hamilton College, Clinton, New York, in 1820, and from Princeton Theological Seminary in 1823. Barnes was ordained as a Presbyterian minister by the presbytery of Elizabethtown, New Jersey, in 1825, and was the pastor successively of the Presbyterian Church in Morristown, New Jersey (1825-1830), and of the First Presbyterian Church of Philadelphia (1830-1867).
He held a prominent place in the New School branch of the Presbyterians during the Old School-New School Controversy, to which he adhered on the division of the denomination in 1837; he had been tried (but not convicted) for heresy in 1836, the charge being particularly against the views expressed by him in Notes on Romans (1835) of the imputation of the sin of Adam, original sin and the atonement; the bitterness stirred up by this trial contributed towards widening the breach between the conservative and the progressive elements in the church. He was an eloquent preacher, but his reputation rests chiefly on his expository works, which are said to have had a larger circulation both in Europe and America than any others of their class.
Of the well-known Notes on the New Testament, it is said that more than a million volumes had been issued by 1870. The Notes on Job, the Psalms, Isaiah and Daniel found scarcely less acceptance. Displaying no original critical power, their chief merit lies in the fact that they bring in a popular (but not always accurate) form the results of the criticism of others within the reach of general readers. Barnes was the author of several other works of a practical and devotional kind, including Scriptural Views of Slavery (1846) and The Way of Salvation (1863). A collection of his Theological Works was published in Philadelphia in 1875.
In his famous 1852 oratory, "What to the Slave is the Fourth of July?", Frederick Douglass quoted Barnes as saying: "There is no power out of the church that could sustain slavery an hour, if it were not sustained in it."
Barnes died in Philadelphia on December 24, 1870.
Verse 5
Be born of water - By “water,” here, is evidently signified “baptism.” Thus the word is used in
Ephesians 5:26;
Titus 3:5. Baptism was practiced by the Jews in receiving a Gentile as a proselyte. It was practiced by John among the Jews; and Jesus here says that it is an ordinance of his religion, and the sign and seal of the renewing influences of his Spirit. So he said
Mark 16:16, “He that believeth and is baptized shall be saved.” It is clear from these places, and from the example of the apostles
Acts 2:38,
Acts 2:41;
Acts 8:12-13,
Acts 8:36,
Acts 8:38;
Acts 9:18;
Acts 10:47-48;
Acts 16:15,
Acts 16:33;
Acts 18:8;
Acts 22:16;
Galatians 3:27, that they considered this ordinance as binding on all who professed to love the Lord Jesus. And though it cannot be said that none who are not baptized can be saved, yet Jesus meant, undoubtedly, to be understood as affirming that this was to be the regular and uniform way of entering into his church; that it was the appropriate mode of making a profession of religion; and that a man who neglected this, when the duty was made known to him, neglected a plain command of God. It is clear, also, that any other command of God might as well be neglected or violated as this, and that it is the duty of everyone not only to love the Saviour, but to make an acknowledgment of that love by being baptized, and by devoting himself thus to his service.
But, lest Nicodemus should suppose that this was all that was meant, he added that it was necessary that he should “be born of the Spirit” also. This was predicted of the Saviour, that he should “baptize with the Holy Ghost and with fire,”
Matthew 3:11. By this is clearly intended that the heart must be changed by the agency of the Holy Spirit; that the love of sin must be abandoned; that man must repent of crime and turn to God; that he must renounce all his evil propensities, and give himself to a life of prayer and holiness, of meekness, purity, and benevolence. This great change is in the Scripture ascribed uniformly to the Holy Spirit,
Titus 3:5;
1 Thessalonians 1:6;
Romans 5:5;
1 Peter 1:22.
Cannot enter into - This is the way, the appropriate way, of entering into the kingdom of the Messiah here and hereafter. He cannot enter into the true church here, or into heaven in the world to come, except in connection with a change of heart, and by the proper expression of that change in the ordinances appointed by the Saviour.