“For unto you it is given in the behalf of Christ,
not only to believe on him,
but also to suffer for his sake”
“For unto you it is given … to believe on him”
“It is represented here as a privilege to be permitted to believe on Christ.
(1) It is an honor to a man to believe one who ought to be believed, to trust one who ought to be trusted, to love one who ought to be loved.
(2) It is a privilege to believe on Christ, because it is by such faith that our sins are forgiven; that we become reconciled to God, and have the hope of heaven“
“But also to suffer for his sake”
“Here it is represented as a privilege to suffer in the cause of the Redeemer – a declaration which may sound strange to the world. Yet this sentiment frequently occurs in the New Testament. Thus, it is said of the apostles Act 5:41, that “they departed from the presence of the council, rejoicing that they were counted worthy to suffer shame for his name” Col 1:24. “Who now rejoice in my sufferings for you” 1Pe 4:13. “But rejoice, inasmuch as ye are partakers of Christ’s sufferings” compare Jas 1:2; Mar 10:30; see the notes at Act 5:41. It is a privilege thus to suffer in the cause of Christ”
– Albert Barnes