Matthew 5:28

28. Looketh… to lust Where the will consents, and the volition permits the sensual feeling. Yet not every glance of admiration or desire, cast upon the beauty of one of the opposite sex, is here condemned. Such affections are planted in our nature for pure and beneficial purposes. Not even the recognition of the superior attractions of another man’s wife, or another woman’s husband, is transgression. Indeed, the sentiment of pleasure arising from beauty of persons around us, may be as pure as the pleasure of surveying pictures. A sweet voice is justly pleasant to the ear, a graceful manner to the taste, a fair form or face to the eye. But when from a sentiment it becomes a sensation, the danger commences. If the sensation be volitionally permitted, there is guilt. If nothing but opportunity were wanting to the guilty act, the adultery of the heart is fully committed. God, who sees the heart, holds the hidden man guilty.