LotR -- Book 1 - Chapter 04 – A Short Cut to Mushrooms

[Bombadil]

Further evidence of such beliefs in keeping an oath shown in the Silmarillion:

For so sworn, good or evil, an oath may not be broken, and it shall pursue oathkeeper and oathbreaker to the world's end.

Which brings up an interesting point about what drives many characters in Tolkien's world. Off-topic, Fëanor truly had the lust for the Silmarils, but was that same lust within his sons? Or were they simply driven by the oath to death? On-topic, was Sam really just following his oath? Was there more to it?