The eternal forces of nature are summoned to serve as witnesses in a profound moral trial between God and the nation. The mountains are called upon because they stand forever, having existed since the days of creation when the earth was born from the deep [אבן עזרא, מלבי״ם]. These strong, enduring peaks act as the very foundations of the earth [רד״ק, מצודת ציון, ביאור שטיינזלץ]. Through poetic repetition, this concept of unbreakable natural strength is emphasized [מצודת דוד]. Alongside this physical understanding, an allegorical approach views the mountains and earthly foundations as a reference to the forefathers and the deep roots of the nation [רד״ק].
The essence of this trial is God's dispute with the people over their sins against Him, aiming to show that God is entirely righteous in His judgment [מלבי״ם]. The process involves a clear resolution of the facts [מצודת ציון]. However, there is a subtle distinction in how God addresses different segments of the nation. When dealing with the general masses, God brings forward direct claims and a dispute. In contrast, when addressing the great and wise leaders of the nation, God approaches them gently, engaging in a thoughtful debate built on logical proofs [מלבי״ם].