I like this passage from the book The Road is How by Canadian naturalist Trevor Herriot:
Is there a way to love, I wonder, without ever scaring one another? Without the descent off rooftops and into old age, without knowing the fear in one another’s eyes? Somehow in this life, it is the heaviness that lets a bird launch into flight, and the uncertainty ahead that makes us walk new pathways.
In other words, take the fear with the love, the heaviness with the lightness, the uncertainty with the sureness, and be grateful. For without these former elements, we would never know the grace of the latter.