Standing on the threshold of the Land of Israel, the people face a critical moment of reflection. Moses addresses them not to deliver new information, but to demand they internalize the deep meaning of the events they have lived through. He calls on them to reflect, understand, and accept God's rebuke based on their past experiences [רש״י, מזרחי, שפתי חכמים]. The ultimate test of their knowledge of God rests squarely upon them at this very moment [אור החיים]. Moses clarifies that he is speaking directly to the people standing before him, not to their children [רש״י, גור אריה, רש״ר הירש]. He draws a sharp distinction between the current generation and future ones. Future generations will observe the Torah primarily through faith and the traditions handed down by their ancestors. The current generation, however, possesses clear, sensory knowledge of God, having witnessed His miracles with their own eyes [מלבי״ם, רש״ר הירש]. Because of this direct, firsthand experience, they bear a much heavier responsibility. If they sin, they are liable for a more severe punishment, as they can never claim ignorance [הדר זקנים, דעת זקנים, בכור שור].
Moses recounts the specific experiences that shaped the faith of this generation, beginning with God's discipline. This concept reflects God's providence and educational guidance, similar to a father disciplining his son [רשב״ם, רש״ר הירש]. However, the primary approach among commentators is that this discipline refers to the severe punishments God inflicted upon those who defied His will, including both the Egyptians and the sinners among the Israelites in the desert [רמב״ן, ביאור יש״ר, העמק דבר]. This discipline was not purely punitive. The specific manner in which God is referenced here indicates that His actions contained a harmonious blend of both strict justice and deep mercy [אלשיך]. Moses also reminds them of God's greatness, which was displayed when He overrode the laws of nature to bring the Israelites out of Egypt and provide for their needs in the barren desert, even when all natural hope had vanished [אבן עזרא, העמק דבר, רש״ר הירש]. This greatness is viewed by some as a demonstration of God's supreme exaltation over Pharaoh [רמב״ן], while others see it as a profound symbol of divine kindness and compassion [רבנו בחיי, אלשיך].
The immense power God wielded to alter nature and strike Egypt is further illustrated through the imagery of a strong hand and an outstretched arm [העמק דבר, רש״ר הירש]. Fundamentally, both concepts represent the attribute of strict justice, yet a clear hierarchy exists between them. Just as the human hand is physically weaker than the upper arm, God's hand represents a softer form of justice. It draws its strength from the arm, which symbolizes a much harsher and more severe level of judgment [רבנו בחיי]. The hand signifies the plagues that struck Egypt, whereas the arm represents the ultimate sword of calamity and destruction [אלשיך]. Furthermore, the strong hand was not designed solely for punishment, but also to hold up and support those who faithfully observe His commandments [רמב״ן]. Conversely, the outstretched arm illustrates the terrifying speed of God's retribution. It is compared to a raised arm, poised and ready to strike instantly at anyone who returns to sin, leaving no margin of time for escape [רמב״ן, ספורנו, העמק דבר].