Respect of persons violates the command to love all alike “as thyself.”
ye commit sin - literally, “ye work sin,” Mat 7:23, to which the reference here is probably, as in Jam 1:22. Your works are sin, whatever boast of the law ye make in words (see on Jam 2:8).
convinced - Old English for “convicted.”
as transgressors - not merely of this or that particular command, but of the whole absolutely.