en_tn_lite_do_not_use/rom/01/16.md

I am not ashamed of the gospel

You can translate this in a positive form. Alternate translation: "I trust completely in the gospel" (See: rc://en/ta/man/translate/figs-litotes)

it is the power of God for salvation for everyone who believes

Here "believes" means that one puts his trust in Christ. Alternate translation: "it is through the gospel that God powerfully saves those who put their trust in Christ" (See: rc://en/ta/man/translate/figs-explicit)

for the Jew first and for the Greek

"for Jewish people and also for Greek people"

first

Here "first" means coming before all others in order of time.