And this is His commandment: that we should believe in the name of His Son, Jesus Christ, and we should love one another just as He commanded us.
Verse 23. And this is his commandment. His commandment, by way of eminence; the leading, principal thing which he enjoins on us; the commandment which lies at the foundation of all true obedience. That we should believe on the name of his Son Jesus Christ. . Comp. . And love one another, etc. This follows from the other, and hence they are mentioned as together constituting his commandment. .
23 And this is his commandment He again accommodates a general truth to his own purpose. The meaning is, that such is the discord between us and God, that we are kept off from an access to him, except we are united by love to one another. At the same time he does not here commend love alone, as before, but joins it as the companion and attendant of faith.
Summing up of God's commandments under the Gospel dispensation in one commandment. this is his commandment--singular: for faith and love are not separate commandments, but are indissolubly united. We cannot truly love one another without faith in Christ, nor can we truly believe in Him without love. believe--once for all; Greek aorist.