This is not a sarcastic comment but a statement of fact. The word stupid refers to those who are called foolish in the bible.
Examples:
Psalms 14:1 The fool has said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that does good.
Proverbs 18:2 A fool has no delight in understanding, but that his heart may discover itself.
The fools are those who ”look without seeing and listen without hearing or understanding. This people's heart has grown coarse, their ears dulled, they have shut their eyes tight to avoid using their eyes to see, their ears to hear, their heart to understand, changing their ways and being healed by me.”
To make His point clear, He used the commandment “thou shalt not kill.” It’s a very straightforward command yet we like to think that one is justified to kill out of self-defense, to punish a criminal or to protect one’s property or rights (i.e. abortion). To think this way is to be a fool.
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How do I know if I am to take His message in a nonliteral way (figuratively speaking)? You derive My true meaning. You know where I Am coming from.
Knowing who God is serves as the way by which we understand Him clearly. The misinterpretations of God’s words come about due to a lack of knowledge of God Himself. This holds true for anyone --- when we know a person well, we know exactly what they mean – often, even when no words are said.
Note the way God answered my question. His message for literal translation is very “matter-of fact” whereby His message for nonliteral translation is a play of words. In both answers, God is not answering my question “How do I know?” but rather giving me the grace to know. Thus, I understand His words (be this literal or figurative) 'Because to you is granted to understand the mysteries of the kingdom of Heaven … blessed are your eyes because they see, your ears because they hear!”