Jamieson, Fausset & Brown

For, &c.--enforcing the warning, Heb 3:12. partakers of Christ--(Compare Heb 3:1, Heb 3:6). So "partakers of the Holy Ghost" (Heb 6:4). hold--Greek, "hold fast." the beginning of our confidence--that is, the confidence (literally, substantial, solid confidence) of faith which we have begun (Heb 6:11; Heb 12:2). A Christian so long as he is not made perfect, considers himself as a beginner [BENGEL]. unto the end--unto the coming of Christ (Heb 12:2).