Neither eyes or hands, but heart that's the issue

Reading from Matthew 5:27-30 I was struck by the verse relating to adultery beginning in the heart. It appeared to me, for the first time (for those who have seen this, please pardon my weakness in thought) that when Jesus says if the eye or the hand is the real reason for the sin, then be rid of them, that he was, for lack of a better term, being sarcastic. He had already said that the issue was the heart. It appears to me that he mentions the eye and hand to demonstrate the severity of the issue. Even if one eye or one hand were removed, still one of each would remain. The heart, the heart, the heart must be removed, must be remade. That is his point. We lust because our heart is corrupt. Jesus has come to give us a new heart Jer 31:33. Thankful for salvation, for without it, not only would I loose my eyes and hands in hell, but I fear my entire soul, as well.