This is the resurrected Christ speaking to them, so when He spoke of enduring to the end, He was speaking from His own serious experience and perspective. When He said, “I am the law and light,” it is important to remember here that Jesus Christ had already overcome death and had been resurrected. So He was speaking from a different perspective now in giving these commandments and promises. The people in Bountiful had put their fingers in the tokens of His sacrifice, and so they knew what He was saying. When he said, “I am the law, I have done this,” it seems like a very different perspective from before. Jesus had spoken as one who would be going to do these things. He is now speaking as one truly having even greater power and authority.