Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. On account of these the wrath of God is coming. In these you too once walked, when you were living in them.
Kill all these evil things; do not let them live in you for a single moment. The command applies, not only to the grosser actions which are summed up under the head of fornication and uncleanness, but to all that leads to those foul sins; not only to the fire, but also to the sparks … God give us grace to kill these loathsome things at once, for if thoughts of evil are indulged, they soon become acts of evil, and then who knows how far we may go in the way of unholiness? Sin, if allowed to grow in the heart, will soon take gigantic strides, and come out in the life.
—Charles H. Spurgeon
The Metropolitan Tabernacle, 2679 – Exposition.