It helps that I love my life, my family, my friends, my students, my job, my community, my nation, and my world. Sure, there are aspects that could probably be changed for the better, but I generally feel quite blessed. Still, I recognize that not everyone has been as fortunate as me. Thus, I try to spread the joy and enthusiasm that I have without requiring that anyone else join in.
I have plenty to spare, so I like to use it to brighten people's days.