Therefore
Part of speech: adverb
Definition: For that or this purpose, referring to something previously stated. Consequently, by or in consequence of that or this cause; referring to something previously stated.
Example sentence: I am rare, and there is value in all rarity; therefore, I am valuable.
Hence
Part of speech: adverb
Definition: as a result; therefore, for this reasonfrom this time, from nowfrom this source or originfrom here, from this place, awayfrom the living or from this worldhenceforth, from this time
Example sentence: Sometimes the most beautiful thing is precisely the one that comes unexpectedly and unearned, hence something given truly as a present.