1TH 1:5

5 We know that he chose you because [when] we told that message to you, we did not speak only words. The Holy Spirit [helped us to speak] powerfully/effectively, and he strongly assured [us that he was powerfully working in you by means of] the message [about Christ] that we [told to you. You yourselves know that], because you know how we spoke and how we conducted ourselves when we were with you, in order that [we might help] you.