John Gill's Bible Commentary Ver. 2. And know you this day , etc.] Take notice of, and diligently attend unto, what is now about to be delivered: for I speak not unto your children which have not known, and which have not seen, the chastisement of the Lord your God ; who have no knowledge and experience of the chastisement of the Lord on themselves, or on their foes or friends; and with whom the argument drawn from it could not come with that force, and make that impression, as it might be thought it would, being used with them who had perfect knowledge of it. The Targums of Onkelos and Jonathan render it doctrine, which, being children, they were not instructed so perfectly in as they were who were adult persons, to whom Moses directs his discourse: his greatness, his mighty hand, and stretched out arm : the exceeding greatness of his power, displayed in the following instances.
Matthew Henry Commentary
Verses 1-7 - Observe the connexion of these two; Thou shalt love the Lord, and kee his charge. Love will work in obedience, and that only is acceptabl obedience which flows from a principle of love, 1Jo 5:3. Moses recount some of the great and terrible works of God which their eyes had seen What our eyes have seen, especially in our early days, should affec us, and make us better long afterwards.
Original Hebrew וידעתם3045 היום3117 כי3588 לא3808 את854 בניכם1121 אשׁר834 לא3808 ידעו3045 ואשׁר834 לא3808 ראו7200 את853 מוסר4148 יהוה3068 אלהיכם430 את853 גדלו1433 את853 ידו3027 החזקה2389 וזרעו2220 הנטויה׃5186