Rajani, Its a metaphor that has been used by Mark Twain!
Swedish Sunset is supposed to be the most beautiful sunset seen anywhere in the world! Happiness is a feeling which is very beautiful and blissfula dn thus by ignoring the very thing that will make us truly happy is compared to looking away from something that is magnificent and heavenly!
Trust I have managed to explained it properly! Thanks for sharing a lovely quote Chinmoy!