When we do what we should do in the Great Commission, we are obeying God. When we do not do what we should do, we are disobeying God.
The filling of His Spirit comes by yielding to His control and by faith depending on His enablement.
You must be a witness before you can witness. The noun must proceed with the verb.
When we follow Christ, He will make us fishers of men. If we are not fishing for men, it is evidence that we are not following Christ.