Moses
Deuteronomy 30:16ESV·traditional attribution

If you obey the commandments of the LORD your God that I command you today, by loving the LORD your God, by walking in his ways, and by keeping his commandments and his statutes and his rules, then you shall live and multiply, and the LORD your God will bless you in the land that you are entering to take possession of it.

Matthew Henry Presbyterian @wholebiblehenry

Moses here concludes with a very bright light, and a very strong fire, that, if possible, what he had been preaching of might find entrance into the understanding and affections of this unthinking people. What could be said more moving, and more likely to make deep and lasting impressions?

Commenting on Deuteronomy 30:15-20

John Gill Reformed Baptist @doctorgill

In that I command thee this day to love the Lord thy God,.... Which is the sum and substance of the first table of the law, and includes the whole worship of God, the contrary to which are idolatry, superstition, and will worship, from which Moses had been dissuading and deterring them: to walk in his ways; which he has prescribed, as his will to...

Jamieson-Fausset-Brown Reformed @jfbcommentary

DEATH AND LIFE ARE SET BEFORE THE ISRAELITES. (Deu 30:15-20) See, I have set before thee this day life and good, and death and evil--the alternative of a good and happy, or a disobedient and miserable life. Love of God and compliance with His will are the only ways of securing the blessings and avoiding the evils described.

Commenting on Deuteronomy 30:15-20