Colossians 1:28-29"Work very hard..."
28 So everywhere we go, we tell everyone about Christ. We warn them and teach them with all the wisdom God has given us, for we want to present them to God, perfect [or mature] in their relationship to Christ.
29 I work very hard at this, as I depend on Christ's mighty power that works within me. (NLT)
"Depend on Christ's mighty power..."
Both. At the same time.
If you only do one without the other, you'll never get anything done.