the travel of heart

i haven't read so tasteful a book for a longlong time.it guided me to wander around  such a beatiful world ,where i found the answer of my puzzle.

what's the true happiness?nothing else.only that is determined the mood.

what could be saved?nothing else.only memorise.

what could be lasting? nothing else,only time.

what could be done?nothing else,only encouraging for each other.