Here is the key concept we must understand, and it applies to all of life: the gospel calls us into both form and freedom, both structure and liberation.
Sex is like fire. In the fireplace it keeps us warm. Outside the fireplace it burns the house down.
-Robert C. Ortlund, Jr.
Whoever refuses to obey any command and teaches other people not to obey that command will be the least important in the kingdom of heaven. But whoever obeys the commands and teaches other people to obey them will be great in the kingdom of heaven.
Your life is a teacher, an instructor to others that carries much more weight than your words.
However, if your life reflects God, your few words will matter greatly.
By holding on to a sin, by coddling a vice, you automatically teach others to do the same.
The preacher who speaks condescendingly toward his wife or displays anger at other drivers teaches his flock to also do this, despite what he may say on Sunday.
Love God with all your heart. Love all people. And you will be teaching others to do likewise without having to open your mouth. Every command falls under this.