Whereby (pro o). "Looking to which," "according to which." When ye read (anaginwskonte). This Epistle will be read in public. My understanding in the mystery of Christ (thn sunesin mou en twi musthriwi tou Cristou). My "comprehension" (sunesin, Colossians 1:9 ; Colossians 2:2 ). Every sermon reveals the preacher's grasp of "the mystery of Christ." If he has no insight into Christ, he has no call to preach.