I had a conversation the other morning with a friend on the need to have a certain lightness in the way we hold life each day, a kind of simplicity. Getting the balance between the demands of love and the pull it places on the heart on one hand and detachment  on the other is not easy. However, modern society stimulates attachment,  so the letting-go perspective of all the wisdom and religious traditions is a useful reminder.  The fact that it is a consistent presence in all cultures would suggest that it is a truth closely related to our deepest happiness:

So you should view this fleeting world
As a star at dawn, a bubble in a stream,
A flash of lightning in a summer cloud,
A flickering lamp, a phantom, and a dream.

Diamond Sutra