In Colossians 2:6-7, Paul instructs us "As you therefore have received Christ Jesus the Lord, so walk in Him, rooted and built up in Him…"
We received Jesus Christ in the past.
We walk in Him in the present and continue to do so in the future.
We are deeply rooted in Him, internally, including our thoughts and feelings, so that they honor Christ.
We are built up in Him so that our visible, external actions reflect Jesus Christ.
Every facet of our being, and our very existence is a testimony to our Lord.