en_tn/1co/16/18.md

For they have refreshed my spirit

Paul is saying he was encouraged by their visit.

acknowledge people like them

The word "acknowledge" here might be an understatement. Paul wants the Corinthians to honor Stephanas, Fortunatus, and Achaicus (verse 17) and others like them. (See: rc://en/ta/man/jit/figs-hyperbole)