Indeed, the word of God is living and effective, sharper than any two-edged sword, penetrating even between soul and spirit, joints and marrow, and able to discern reflections and thoughts of the heart... (Heb 4:12).
We must prepare for the “way of the Lord” (First Reading).
The Lord who comes is totally different from the worldly lords. He will restore his people, free them from sufferings and evil rule. Prepare the “way of the Lord.” (Gospel Reading), through repentance (change of teachers).
When the Lord comes, we must be prepared (=be found blameless in his sight) (Second Reading).
What are we preparing for? Who is this person / Lord who deserves our preparation? What kind of preparation should we make according to the readings? We must inculcate that preparations for the coming of the Lord is equivalent to repentance from sinful living.
What is to repent? To give up self-rule (living independently from God, living according to the values of this world) and to be ruled by Jesus adoption of Jesus as our teacher, no other else, to lead us to salvation.