Apathy can be overcome by enthusiasm and enthusiasm can only be aroused by two things: first an ideal with takes the imagination by storm and second a definite intelligible plan for carrying that ideal into practice.
The last few years have been my happiest. I'm happy in the years that most people are blue and sad and waiting to die. I don't feel that a bit. Smiling has a lot to do with it. You can just lift your spirits by smiling a little bit.