Can we know what happiness is without sadness?
No
* Yes. For example before fall of man!
* “We can never appreciate heaven without having passed through hell?”
* I think this is the answer you are looking for! 2 Nephi 2:11 For it must needs be, that there is an opposition in all things. If not so, my firstborn in the wilderness, righteousness could not be brought to pass, neither wickedness, neither holiness nor misery, neither good nor bad. Wherefore, all things must needs be a compound in one; wherefore, if it should be one body it must needs remain as dead, having no life neither death, nor corruption nor incorruption, happiness nor misery, neither sense nor insensibility.
* Yes because neutral would be the new sadness, as is relative.
* Can we know what an…