Divine revelation is an overwhelming, unstoppable force that strikes the listener with a power that leaves no choice but action. When the Creator delivers a message, its impact is so profound that the messenger is completely compelled to pass it on, regardless of social pressures or personal desires.
The natural, universal reaction to the roar of a predatory lion is pure terror. Building on this basic human response, [מלבי״ם] points out a logical progression: if the sound of a mere animal can awaken such deep fear, the voice of God will certainly terrify whoever hears it. Exactly as it is impossible not to fear the lion, a prophet is entirely incapable of suppressing a divine message and remaining silent [רש״י, מצודת דוד]. This internal obligation remains absolute even when the message is harsh, offers no comfort, and is deeply unpleasant for both the prophet and the audience to hear [ביאור שטיינזלץ]. Understanding this sheer lack of choice leads to a sharp rebuke directed at the public: how can the people dare to command their prophets to stay quiet, when the prophet is trembling at the voice of God and is simply powerless to hold back His word [רד״ק]?
Beyond the prophet's intense personal experience, these messages serve a broader systemic purpose of divine oversight and warning. Prophecy is never a random occurrence; rather, it is a careful expression of providence meant to alert the public [מצודת דוד]. God never brings about a disaster without first revealing His plans to the prophets so they can warn the people. Therefore, if the public hears the warning but chooses not to repent, the resulting tragedy is not an arbitrary punishment from God. Instead, it is the direct consequence of the people's own actions, bringing the disaster upon themselves [מלבי״ם].
The unimaginable power of God, compared here to a lion, is brought to life through a tradition about an emperor who mocked this comparison, arguing that a strong human warrior could easily kill a lion. In response, Rabbi Yehoshua prayed and summoned a miraculous lion from a distant forest. From hundreds of miles away, the beast let out a roar so powerful that it collapsed city walls, terrified the inhabitants, and threw the paralyzed emperor from his throne. Coupled with the emperor's inability to even stare at the blazing sun—which is merely one of God's servants—the event made it clear that the human mind cannot possibly grasp the true magnitude of the Creator, much less remain indifferent when faced with His spoken word [צאינה וראינה].