איוב, פרק ל״א, פסוק כ״ח

True faith demands absolute loyalty, extending far beyond physical actions to the quiet, hidden spaces of the mind and heart. Turning toward idolatry or placing trust in forces other than God is a profound betrayal, even if these feelings never leave the realm of private thought. The primary approach among commentators is that while people are generally not punished for negative thoughts that do not result in action, heresy is an exception. In matters of faith, the mere thought of denying God is a severe offense that warrants strict judgment and punishment.

This unique severity exists because heresy is an offense directed intimately at God, who searches and knows all human thoughts. Because He is the master of the mind, the internal thought itself constitutes a complete crime [אלשיך]. Furthermore, this betrayal remains a serious offense even if it is entirely hidden from the eyes of others, and even if human society does not view such private thoughts as harmful or punishable [ביאור שטיינזלץ].

The essence of this internal betrayal lies in denying the true source of all blessing. This happens when a person attributes their success, wealth, and honor to alternative powers, such as the sun, the moon, or the stars, rather than recognizing that God provides everything [רמב״ן, מלבי״ם]. Attributing divine power to the very things God created [מצודת דוד], or placing one's ultimate trust in material wealth and feeling prideful rather than satisfied with what one has been given, is a complete rejection of God who rules from above.