The Stories of the Lotus Sutra, p151Basic to the teachings of this Sutra is a kind of promise, an assurance, that each and every living being has the potential to become a buddha. This tells us something about ourselves, of course, but here the light is shining in the other direction, encouraging us to see the buddha in others—regardless of their moral or other qualities.
In an important sense, this story [about Devadatta] is not so much about Devadatta as it is about Shakyamuni Buddha. It does not teach us that Devadatta was able to become a buddha because his inner intentions were really good, or because he changed his ways and became a good man, or because of anything else he did or did not do. What this story teaches is that the Buddha is one who can see the buddha in others. And that is what we are encouraged by this story to do – to look for and see the buddha in all those we encounter.