Jamieson, Fausset and Brown on Philippians 3:10

10. That I may know him--experimentally. The aim of the "righteousness" just mentioned. This verse resumes, and more fully explains, "the excellency of the knowledge of Christ" (Php 3:8). To know HIM is more than merely to know a doctrine about Him. Believers are brought not only to redemption, but to the Redeemer Himself.

the power of his resurrection--assuring believers of their justification (Ro 4:25; 1Co 15:17), and raising them up spiritually with Him, by virtue of their identification with Him in this, as in all the acts of His redeeming work for us (Ro 6:4; Col 2:12; 3:1). The power of the Divine Spirit, which raised Him from literal death, is the same which raises believers from spiritual death now (Ep 1:19, 20), and shall raise their bodies from literal death hereafter (Ro 8:11).

the fellowship of his sufferings--by identification with Him in His sufferings and death, by imputation; also, in actually bearing the cross whatever is laid on us, after His example, and so "filling up that which is behind of the afflictions of Christ" (Col 1:24); and in the will to bear aught for His sake (Mt 10:38; 16:24; 2Ti 2:11). As He bore all our sufferings (Is 53:4), so we participate in His.

made conformable unto his death--"conformed to the likeness of His death," namely, by continued sufferings for His sake, and mortifying of the carnal self (Ro 8:29; 1Co 15:31; 2Co 4:10-12; Ga 2:20).