And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: that I may know him, in the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death. (Philippians 3:9–10) Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus. Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, I press toward the mark for the prize of the high calling of God in Christ Jesus. (Philippians 3:12–14)
And the fellowship of his sufferings - That I may participate in the same kind of sufferings that he endured; that is, that I may in all things be identified with him. Paul wished to be just like his Saviour. He felt that it was an honor to live as he did; to evince the spirit that he did, and to suffer in the same manner. All that Christ did and suffered was glorious in his view, and he wished in all things to resemble him. He did not desire merely to share his honors and triumphs in heaven, but, regarding his whole work as glorious, he wished to be wholly conformed to that, and, as far as possible, to be just like Christ. Many are willing to reign with Christ, but they would not be willing to suffer with him; many would be willing to wear a crown of glory like him, but not the crown of thorns; many would be willing to put on the robes of splendor which will be worn in heaven, but not the scarlet robe of contempt and mockery. They would desire to share the glories and triumphs of redemption, but not its poverty, contempt, and persecution. This was not the feeling of Paul. He wished in all things to be just like Christ, and hence he counted it an honor to be permitted to suffer as he did. So Peter says, “Rejoice, inasmuch as ye are partakers of Christ’s sufferings;” 1 Peter 4:13. So Paul says Colossians 1:24 that he rejoiced in his sufferings in behalf of his brethren, and desired “to fill up that which was behind, of the afflictions of Christ,” or that in which he had hitherto come short of the afflictions which Christ endured.
Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you: But rejoice, inasmuch as ye are partakers of Christ’s sufferings in that, when his glory shall be revealed, ye may be glad also with exceeding joy. If ye be reproached for the name of Christ, happy are ye; for the spirit of glory and of God resteth upon you: on their part he is evil spoken of, but on your part he is glorified. But let none of you suffer as a murderer, or as a thief, or as an evil doer, or as a busybody in other men’s matters. Yet if any man suffer as a Christian, let him not be ashamed; but let him glorify God on this behalf. (I Peter 4:12 –16) Amen.
Resource: Barnes’ Commentary