"HOMILYAbout guarding of the heart
"With closest custody, guard your heart, for in it are the sources of life" (Proverbs 4:23).
In the heart is the will, in the heart is love, in the heart is understanding, in the heart is the face of the All-holy and Divine Trinity. The heart is the home of the Father, the altar of the Son and the workshop of the Holy Spirit. God wants the heart: "My Son, give me your heart" (Proverbs: 23:26).
Let the mountains be overturned, let the seas dry up, let your friends abandon you, let your wealth fail you, let your body be consumed by worms, let the world pour upon you all the ridicule which it has but be not afraid; only guard your heart, guard and affix it to the Lord and give it to the Lord.
From the heart comes life; from where does life in the heart come if the breath of the Lord and Source of Life, God, does not dwell in it?
"A good man out of the good treasure of the heart brings forth good things; and an evil man out of the evil treasure brings forth evil things" (St. Matthew 12:35).
These are the words of the Lord Who fills the treasury of your heart with His riches. What is that "good man?" That is the good treasure of the heart. What is that "evil man?" That is the evil treasure of the heart. "For out of the heart [of an evil man] proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies" (St. Matthew 15:19) and from the good heart proceeds "love, joy, peace, long-suffering, gentleness, goodness, faith, meekness, temperance" (Galatians 5:22-23).
Do you see how great a warehouse is the heart of man? Do you see what all can fit in the heart of man? O brother, God the Holy Spirit Himself, when it pleases Him, can fit in the heart of man. Not only can He, but He will. He only waits for you to prepare your heart for Him. To convert it into a temple, for God the Holy Spirit only dwells in a temple.
Just as a serpent protects its head so you, also son, guard your heart. Above everything that is guarded, son, guard your heart! For in the heart enters life and from it proceeds life, life which is from the Living God.
O Life-giving Lord, help us to guard our heart for You, for You the Lord!
To You be glory and thanks always. Amen." St Nikolai Velimirovich
From the homily for June 6, Prologue of Ochrid. Source