Jesus' words present us with a serious challenge. We call him Lord, and yet we are not always obedient to his word. He says that the measure of whether or not he really is our Lord is how much we are doing his word. Not just hearing it. Not just reading and studying it. Not even how much we might memorize it. If we are not actually doing his word, then he is not actually our Lord.
Are we listening to the Lord? Are we hearing his words? Are we applying his words to our circumstances, or are we dwelling on our problems? Are we willing to listen to him rather than trying to figure out the solution for ourselves? Listening to God's word means taking time away from the activity of problem solving. It means setting the problem aside in order to focus on Jesus.
Oh Lord, what is your mind on the matter? What is on your heart? What do you mean when you say such and such? Open my heart and lead me and guide me in your word. Cause me to know your word, and give me your understanding. Expand my horizon through your word. Let me grasp your word and grant me grace to apply it in my life.
We might be very surprised at the breadth of his answer.
"Your word, O Lord, will last forever; it is eternal in heaven.
Your faithfulness endures through all the ages; you have set the earth in place, and it remains." (Psalm 119:89-90)