This Supreme Lawgiver alone can see the behavior of the heart, and alone is able to punish all who offend so much as in thought. It were a vain thing, for men to give laws to any, more than what they can require account of and correct which is only the surface and outside of human actions. But He who made the heart, doth not only give His law to it, but to it principally, and examines all actions there in their source and beginning; and therefore, oftentimes, that which men applaud and reward, and do well in so doing, He justly hates and punishes.

Robert Leighton (Archbishop of Glasgow, 1611 – 1684)