Wherefore I also, having heard of the faith among you in the Lord Jesus, and your love which extends to all the saints. The "wherefore" has reference to their present standing in grace, described in the verses preceding: since ye have heard, believed, been sealed, and thereby shown to be in the right line, I apply myself towards promoting your progress, towards advancing you to the higher stages of the Christian life.
Special mention is made of their faith and love, as cardinal Christian graces, to which elsewhere the apostle adds hope (1 Corinthians 13:13; 1 Thessalonians 1:3; 2 Thessalonians 1:3). The literal expression, "faith among you" ( καθ ὑμᾶς), indicates that it was a marked social feature, but perhaps not universal; while their love was not mere general amiability, but a love that embraced the saints as such, having a special complacency in them, and being directed to them all.
If it be asked—Could this knowledge of the condition of his correspondents have been derived from hearsay ("having heard") if the letter was addressed to the Ephesians, among whom Paul had lived so long, and whose condition he must have known by personal intercourse (Acts 19:10; Acts 20:31)?
we reply that, though he derived his first acquaintance from personal intercourse, it was some years since he had been at Ephesus, and the ἀκούσας refers to what he had heard in the interval (see Introduction).