Jesus did not come merely to teach us how to act, but to fill our entire life with his presence.
No aspect of our life should be left untouched by God.
St. Gregory of Nyssa writes about this in A treatise on Christian Perfection, "The life of the Christian has three distinguishing aspects: deeds, words and thought. Thought comes first, then words, since our words express openly the interior conclusions of the mind. Finally, after thoughts and words, comes action, for our deeds carry out what the mind has conceived."
We can not live a just life while harboring evil thoughts.
Nor can we have pious thoughts while speaking slander about our neighbor.
All needs to be under the influence of Jesus.
Our life must express a certain "harmony" in order for it to be united with God.
May we always strive for unity in our thoughts, words and deeds.