In my opinion, if one is looking for sources for stuff from which to construct a personal moral philosophy, Jesus, or words attributed to him, is/are one good source. Obviously, it isn't necessary to take the whole job lot, but that's probably true of any source.
Something similar could be said about taking stuff from the bible in general.
But if your cherry picking, then you aren't actually taking anything from it at all. You have to already have a moral philosophy to determine what parts you're going to cherry pick. So, then Jesus and the NT aren't actually a "source" but merely serving as something to dishonestly quote that agrees with what you already think anyways.
I say "dishonestly quote", b/c honest quoting requires acknowledging any other Biblical quotes that are relevant to that issue, and almost everything Jesus said is contradicted by something else he said. That is especially true since Jesus said "Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them, but to fulfill them. For I tell you truly, until heaven and earth pass away, not a single jot, not a stroke of a pen, will disappear from the Law until everything is accomplished"
IOW, Jesus said that everything that in Hebrew law and the OT that was said before him is the law and still applies. So, all the ugliest genocidal intolerance of the OT are included in the "moral philosophy" of Jesus.