Lately I've found a lot of practical comfort in the ideas of Stoicism (tempus fugit, memento mori, etc)

Somewhat orthogonal (and thus compatible with) any other faith/religion you may have.

I've found The Daily Stoic to be a good accessible on-ramp for these ideas: https://dailystoic.com/stoic-response-grief/ https://dailystoic.com/how-to-cure-anxiety/