Here Paul refers to a scripture where Christ (the Messiah) speaks to God. You can translate this in an active form. AT: "the Messiah said to God in the scriptures" (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-activepassive]])
You can translate this in an active form. AT: "For in times past, the prophets wrote everything in the Scriptures to teach us" (See: [[rc://en/ta/man/translate/figs-activepassive]])
# our ... we
Paul includes his readers and other believers. (See: [[rc://en/ta/man/translate/figs-inclusive]])
Here "have confidence" means that the believers will know that God will fulfill his promises. You can make explicit the full meaning in your translation. AT: "In this way the scriptures will encourage us to expect that God will do for us everything that he has promised" (See: [[rc://en/ta/man/translate/figs-explicit]])