That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death;
That I may know him - experimentally; not merely know the doctrine concerning Him: the aim of the "righteousness" (Philippians 3:9). This verse resumes and explains "the excellency of the knowledge of Christ" (Philippians 3:8). Believers are brought, not only to redemption, But to the Redeemer Himself.
The power of (flowing from) his resurrection - assuring believers of justification (Romans 4:25; 1 Corinthians 15:17): raising them up spiritually with Him, by virtue of identification with Him in this, as in all the acts of His redeeming work (Romans 6:4; Colossians 2:12; Colossians 3:1); and about to raise their bodies with His at His coming (Isaiah 26:19; 2 Corinthians 4:10-11). The Divine Spirit which raised Him from literal death is the same "power" which raises believers from spiritual death (Ephesians 1:19-20), and shall raise their bodies from literal death (Romans 8:11).
The fellowship of his sufferings - by identification with Him in His sufferings and death, by imputation; also, in actually bearing the cross laid on us, after His example, so 'filling up that which is behind of the afflictions of Christ' (Colossians 1:24); and in the will to bear anything for His sake (Matthew 10:38; Matthew 16:24; 2 Timothy 2:11; 1 Peter 4:13). As He bore all our sufferings (Isaiah 53:4), so we participate in His.
Conformable unto his death - `formed to the likeness of His death;' namely, by continued sufferings for His sake, and mortifying the carnal self (Romans 8:29; 1 Corinthians 15:31; 2 Corinthians 4:10-12; Galatians 2:20).