By What Authority Are You Doing These Things?
Here is a series of articles (ongoing at this time) that address the importance have God's permission to do whatever we do as well as determining how to fulfill God's commands.
By What Authority Are You Doing These Things? Based on Matthew 21:23-27 where Jesus was asked this question.
Establishing Authority - Direct Commands
Establishing Authority - Approved Examples
Establishing Authority - Necessary Inference
Establishing Authority - Putting it All Together
When God Says Nothing - Respecting God's Silence (1)