Luke 10:28, Do this. Is Yeshua saying here that Torah-obedience (i.e. one’s good works) can guarantee eternal life? A cursory understanding of Yeshua’s words in this passage may cause one to arrive at this conclusion. 

However, previous to this, Yeshua speaks about loving Elohim with the totality of one’s being. Loving Elohim not only involves Torah-obedience, but entering into a right, spiritual relationship with YHVH through Messiah Yeshua, the Living Torah-Word of Elohim as per the Torah itself and the words of Yeshua (e.g. Deut 18:15ff; John 14:16). 

Interestingly, in Mark 12:32, Yeshua has a similar exchange with a scribe. When the scribe quotes the shema as the greatest of all commandments, Yeshua tells him, not that he has eternal life, but that he’s not far from the kingdom (v. 34). At the same time in Luke 18:18–22, Yeshua tells the rich young ruler that it’s impossible to have eternal life by keeping the Torah without also following Yeshua. 

All of these similar teachings of Yeshua when compared reveal to us that Torah-obedience outside of a relationship with Yeshua is insufficient to securing eternal life in Elohim’s kingdom.

Paul summed up his spiritual relationship with Torah and Yeshua when he declared that he was “under law toward Messiah), that I might win those who are without law” (1 Cor 9:21).

John sums up our relationship with Elohim and the Torah-law this way,

Now by this we know that we know Him, if we keep His commandments. He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him. He who says he abides in Him ought himself also to walk just as He walked. (1 John 2:4–6)