All the mighty power and all the great and terrible deeds: the first expression refers to Moses’ power to perform signs and wonders; the second describes the deeds themselves. Translators may say something like the following:

• How great was his power, how mighty [or, awesome] and terrifying the deeds that Moses performed in the presence of the Israelites!

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .