Testimonial from Princess Mhyco L. Esguerra, the Philippines: 
Donating blood is actually the same principle as with giving charity. There are times when it's a complete stranger that would require your help and there are instances that those cries for help do not reach you
I'm just hoping that somewhere, I'm able to help someone even if they are someone I would never be able to meet.
I started donating back in 2012 but I was a lapsed donor for a while due to health issues but now that I'm all cleared, I've made it my personal mission to donate via apheresis monthly.
Do a good turn daily!
(Although you can't actually donate blood or blood components every day, of course, hopefully this is the sign you're looking for.)
Again, there's always someone out there who would need help and you are always someone who can do something to help.