In the sufferings of the Lord Jesus Christ, he took comfort in his mission. He took comfort in the fact that he was securing the salvation of his people. He prolonged his days when he saw his seed. Of course, the Scriptures speak of a chaff as well. There are those in the world that do not belong to Christ, but grow alongside the church- but are not his. As we reflect on the sufferings of Christ we need to be mindful of the fact that if we are his seed; then we have a standard of living that we are to live by. We are to reflect the one who bought us. We are to live lives of holiness as the Lord Jesus Christ lived a life of holiness.
He was put to grief for our lives, let us not put him to grief by our lives.
Isaiah 53:9-10 And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand.
They who are Christ's seed, carry along with them the impression of an obligation to, and an acknowledgment of him in whatever good they have gotten. They think themselves much obliged to Christ, and they acknowledge him for their life (as in Mal. 1.6).. A natively and genuinely disposed child acknowledges his father as his father, and reverences and loves his father as his father, but there are many that pretend to being from Christ, who think not themselves in his debt and common for it, and who know not what it is to walk under the conviction of their obligation to Christ for their supposed spiritual life and being. -Durham, Christ Crucified, 41-413.