‘When Christ, who is our life, shall appear.’ Life here is, by a metonymy, put for the author of life.
We have shewed that Jesus Christ, he is first the author of a believer’s spiritual life. In the 14th of John, ‘I am the Way, the Truth, and the Life,’ (ver. 6.)
Secondly, Jesus Christ, he is the matter of a believer’s spiritual life in John 6:48, ‘I am the bread of life.’ The original hath it more elegantly, ‘I am the bread of that life,’ that is, of that spiritual life of which before the Lord Jesus Christ had spoken.
Thirdly, Jesus Christ is the exerciser and actor of the spiritual life of believers: John 15:5, ‘Without me ye can do nothing.’ The original is, separate from me, or apart from me, ye can do nothing, &c.
Fourthly, The Lord Jesus Christ, he is the strengthener and the cherisher of a believer’s spiritual life, Ps. 138:3, ‘In the day when I cried, thou didst answer me, and strengthen me with strength in my soul.’
Lastly, The Lord Jesus Christ, he is the completer, he is the finisher of the spiritual life of a saint, Heb. 12:2; Phil. 1:6.
Thomas Brooks. Christ is the Life of Believers.