"and also the sons of giants did we see there" — whence we are taught that they saw giants atop giants, as in (Psalms 73:6) "Therefore, pride bestrides them as a giant." (Devarim, Ibid. 20)
"And I said to you, etc.", (32) "and in this thing, etc.": I say this to you not of myself, but at the behest of the Holy One Blessed be He. (29) "Do not break and do not fear them":
Why? (30) "(For) the L-rd your G-d who goes before you, etc." He said to them: He who wrought miracles for you in Egypt, and all of these miracles is destined to perform miracles for you upon your entering the land.