But now (νυν δε). Repeats the very words used in Romans 15:23.

I go (πορευομα). Futuristic present as in John 14:2.

Ministering unto the saints (διακονον τοις αγιοις). Present active participle of purpose like ευλογουντα in Acts 3:26. This collection had been one of Paul's chief cares for over a year now (see Romans 15:2; Romans 15:9). See 2. Corinthians 8:4.