NOM but I just laughed out loud reading the fox and the grapes analogy. Certainly sincerity cannot get anyone love..luck can!
I believe love between a man and woman is temporary...it is more of attraction..for example a marriage which was initiated by love...where later couples grow apart..marriage still continues..not because of love..but due to responsibilities towards each other and towards their children.
Good you expressed your opinion. But, I beg to differ with you. In my view, there is no such thing as Luck.. It's effort that pays you at the end of the day. Love can be made permanent and make it last unto the last with understanding and trust. Of course a few sacrifices from both sides.
It's my personal opinion.