Keep Going in the Face of Meaninglessness.

This must be the fundamental tenet of faith that is so difficult to master.

I mean, we, as people with self-reflexive brains simple must know that we matter on some level beyond the immediate.  I'd say that finding meaning is probably the most difficult item on the list. If you happen to feel content, or have a fair amount of meaning already in  your life, or you simply are submerged in a number of projects that make you feel alive, that's fantastic.

Me, I think that the issue is difficult precisely because it seems to require action while simultaneously requiring the capacity to let go and exist within the moment more often.