What is the meaning of Luke 6:43-45?

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Reference

43 For a good tree bringeth not forth corrupt fruit; neither doth a corrupt tree bring forth good fruit. 44 For every tree is known by his own fruit. For of thorns men do not gather figs, nor of a bramble bush gather they grapes. 45 A good man out of the good treasure of his heart bringeth forth that which is good; and an evil man out of the evil treasure of his heart bringeth forth that which is evil: for of the abundance of the heart his mouth speaketh. (Luke 6:43-45 KJV)

William Burkitt’s Commentary

Our Saviour here and elsewhere frequently compares persons to trees; the heart of man is as the root, the actions as the fruit; as the root is the principle from which the fruit springs, so the heart of man is a principle from which all human actions flow: an holy heart will be accompanied with an holy life, where there is a vital principle of grace within, there will be the actings of grace without; a good conscience will be accompanied with a good conversation.

Observe farther, a double treasure discovered in the heart of man.

1. An evil treasure of sin and corruption, from which flow evil things: but why should sin be called a treasure? Not for the precious- ness of it, but for the abundance of it; a little does not make a treasure: and also for the continuance of it; for though sin be perpetually overflowing in the life, yet does the heart continue full. The treasure of original corruption in man’s heart and nature, though by sanctifying grace it may be drawn low, yet it is never in this life drawn dry.

2. Here is a good treasure of grace discovered in a sanctified and renewed man; which is the source and spring from which all gracious actions do proceed and flow; namely, a sanctified and renewed heart and nature. When once the will of man is made conformable to the will of God, it does will and desire, choose and embrace, take pleasure and delight in, what God approves, commands, and loves; and it will lay an injuction upon all the members of the body to act comformably thereunto.