Which some professing - namely, professing these oppositions of science falsely so called.
erred - (See on 1Ti 1:6; see on 1Ti 2:11) - literally, “missed the mark” (2Ti 3:7, 2Ti 3:8). True sagacity is inseparable from faith.
Grace - Greek, “the grace,” namely, of God, for which we Christians look, and in which we stand [Alford].
be with thee - He restricts the salutation to Timothy, as the Epistle was not to be read in public [Bengel]. But the oldest manuscripts read, “be with you”; and the “thee” may be a transcriber’s alteration to harmonize with 2Ti 4:22; Tit 3:15.