John 15:10

10.If you keep my commandments. He points out to us the method of perseverance. his, to follow where he calls, for, as Paul says,

They who are in Christ walk not according to the flesh, but according to the Spirit,
(Romans 8:1.)

For these two things are continually united, that faith which perceives the undeserved love of Christ toward us, and a good conscience and newness of life. And, indeed, Christ does not reconcile believers to the Father, that they may indulge in wickedness without reserve, and without punishment; but that, governing them by his Spirit, he may keep them under the authority and dominion of his Father. Hence it follows, that the love of Christ is rejected by those who do not prove, by true obedience, that they are his disciples.

If any one object that, in that case, the security of our salvation depends on ourselves, I reply, it is wrong to give such a meaning to Christ’s words; for the obedience which believers render to him is not the cause why he continues his love toward us, but is rather the effect of his love. For whence comes it that they answer to their calling, but because they are led by the Spirit of adoption of free grace?

But again, it may be thought that the condition imposed on us is too difficult, that we should keep the commandments of Christ, which contain the absolute perfection of righteousness, — a perfection which far exceeds our capacity, — for hence it follows, that the love of Christ will be useless, if we be not endued with angelical purity. The answer is easy; for when Christ speaks of the desire of living a good and holy life, he does not exclude what is the chief article in his doctrine, namely, that which alludes to righteousness being freely imputed, in consequence of which, through a free pardon, our duties are acceptable to God, which in themselves deserved to be rejected as imperfect and unholy. Believers, therefore, are reckoned as keeping the commandments of Christ when they apply their earnest attention to them, though they be far distant from the object at which they aim; for they are delivered from that rigorous sentence of the law,

Cursed be he that hath not confirmed all the words of this law to do them,
(Deuteronomy 27:26).

As I also have kept my Father’s commandments. As we have been elected in Christ, so in him the image of our calling is exhibited to us in a lively manner; and therefore he justly holds himself out to us as a pattern, to the imitation of which all the godly ought to be conformed. “In me,” says he, “is brightly displayed the resemblance of those things which I demand from you; for you see how sincerely I am devoted to obedience to my Father, and how I persevere in this course. My Father, too, hath loved me, not for a moment, or for a short time, but his love toward me is constant.” This conformity between the Head and the members ought to be always placed before our eyes, not only that believers may form themselves after the example of Christ, but that, they may entertain a confident hope that his Spirit will every day form them anew to be better and better, that they may walk to the end in newness of life.