Matthew Henry's Concise Commentary on the Bible - 1 John 5:6-8
6-8 We are inwardly and outwardly defiled; inwardly, by the power and pollution of sin in our nature. For our cleansing there is in and by Christ Jesus, the washing of regeneration and the renewing of the Holy Ghost. Some think that the two sacraments are here meant: baptism with water, as the outward sign of regeneration, and purifying from the pollution of sin by the Holy Spirit; and the Lord's supper, as the outward sign of the shedding Christ's blood, and the receiving him by faith for... read more
George Haydock's Catholic Bible Commentary - 1 John 5:8
And there are three that give testimony on earth: the Spirit, the water, and the blood; and these three are one. [3] This is a repetition of what was before said, ver. 6, to be expounded in the same manner. But when it is added, these three are one, the sense is, that they witness one and the same truth. (Witham) --- As the Father, the Word, and the Holy Ghost, all bear witness to Christ's divinity; so the spirit, which he yielded up, crying out with a loud voice upon the cross, and the water... read more