πεποιθησιν 4006 N-ASF δε 1161 CONJ τοιαυτην 5108 D-ASF εχομεν 2192 5719 V-PAI-1P δια 1223 PREP του 3588 T-GSM χριστου 5547 N-GSM προς 4314 PREP τον 3588 T-ASM θεον 2316 N-ASM
Vincent's NT Word Studies
4. Confidence. In the fact that he may appeal to them, notwithstanding their weaknesses and errors.Through Christ to God-ward (dia tou Cristou prov ton Qeon). Through Christ who engenders the confidence, toward God, with reference to God who gives us success, and to whom we must account for our work.
Robertson's NT Word Studies
3:4 {Through Christ} (dia tou cristou). It is not self-conceit on Paul's part, but through Christ.