Let joy lead you
What we catch as glimpses of joy is guidance from higher self (or soul, divine intelligence). It’s a way of communication with our soul which directs us to the best way of living in which we’re the highest contribution to ourselves and others.
Thus there is nothing selfish about following your joy. Simultaneously, we also contribute to the happiness of others in one way or another.
Imagine that there is a divine intelligence that organizes life in the entire universe. Everything should be in harmony and love.
The way to ensure harmony is to send us feelings of joy to make us follow the best life path. Following your joy also lead you to an abundant and happy life.
Of course, not always does it make sense to follow joy. Especially, when we feel like we should take a break or holiday while there is a pile of work to be done. But in these cases, I’ve noticed that the higher-self guides us to rest to prevent burnout and stress.
When we feel burnout, we’re not efficient anyway so from the higher perspective taking a break is sometimes the best (and perhaps the least logical) thing to do.