The Gospel is a precious and comforting word. It comforts and refreshes the sad heart. It wrestles it out of the jaws of death and hell and transports it to the certain hope of eternal life, through faith in Christ.
Imperatives are good for many things. Luther said the Law is good, but precisely because it is good, it has become poison and death to the bad. The Law does not give life but evaluates it, and we encounter day in and day out its negative evaluation of us.