When God calls and sends, He gives us not only the grace we need, but He also confirms His power through signs.
Jesus identifies some of these signs in today's gospel (Mk. 16:15-18). Later on, the disciples and Paul would confirm being bearers of good news by the signs of power in their words and actions.
Today, rest assured that when the Lord assigns you a task, He has already empowered you with His Spirit, and will bless your consent with the evidence of real fruits.
Lord Jesus, help me to say 'yes' to your purpose, so that You may manifest Your power in my life. Amen