Philippians 1:19

For I know that this shall turn to my salvation
Or "to salvation", to the salvation of others; that is, the preaching of Christ by these men, though designed by them to the hurt of the apostle; yet he knew that by the power and grace of God it should be made useful to the conversion, and for the salvation of many souls; and this was matter of rejoicing to him: or that affliction which they thought to have added to his bonds, should it befall him, he knew either from a divine revelation, or from the word of God in general, which gives reason to believe that all things work together for good to the saints, and from his own experience; that this also would turn to his advantage, and be for his good, either temporal, spiritual, or eternal, and would work for him a far more exceeding and eternal weight of glory in the world to come; and even in this world, he knew that every reproach, indignity, and suffering he endured, did but increase his fame and his honour, and make his name the more illustrious among the saints; which was the very thing these men envied in him, and strove to take from him; yea, he knew that the method they took would, quite contrary to their expectation, be the means of his enlargement and liberty, of his salvation and deliverance from his bonds: see ( Philippians 1:25 Philippians 1:26 ) ; and which he believed would be brought about by the prayers of the saints, and particularly these Philippians:

through your prayer;
as Peter was delivered out of prison through the incessant prayer of the church for him. The apostle knew that the prayer of a righteous man availeth much with God, and is very prevalent with him, and much more the prayers of a whole church; wherefore he frequently desired them for him on many accounts; and among others, that he might be delivered out of the hands of unreasonable men; and he firmly believed that he should be delivered by such means:

and the supply of the Spirit of Jesus Christ;
which he had reason to expect and hope would be given him through their prayers for him; for though God has made large provisions for the supply of the wants of his people, in his Son and in his covenant, to be dispensed unto them by his Spirit, yet for these will he be sought unto by them: the supply of the Spirit is a supply of gifts from Christ, fitting and qualifying men for his service, and which are ministered by the Spirit to them severally as he will; and a supply of grace out of the fulness of Christ, which the Spirit of grace is the applier of; and a supply of strength from the same by him, to enable the saints both to do and suffer whatever he is pleased to call, them to; it is in short a supply of all their need, which the Spirit of God helps them to, according to the riches of grace, in glory by Christ: this the apostle knew would be sufficient for him, to support him under his present troubles, to deliver him out of them, and to fit him for whatever future work and service his Lord and master had for him to do.