Motivation is a natural driving force. As stated by Psychology Today, it's a desire to do things. You want to enjoy yourself, increase your acclaim, delight others - the list goes on. There are times where people lack motivation to do things. Is it being preoccupied by other things, exhausted from others that drain our energy or maybe it's just not worth the outcome? Motivation just isn't there when we may need it from others and ourselves.
There are a few things that create motivation. Passion or love can be a determining feeling that feeds motivation. The most important aspect is to create motivation for others. But how do you light a burnt match for someone else? You just can't always inspire others or yourself on a whim.
I struggled with this concept because I knew at a time in my life that I could be as passionate as ever about something, but others just fade away in the background leaving me to dry. And it's not always for something very serious - a school project that classmates just don't want to do, a social gathering where others would rather not go to, etc. The main factor in those regards is you can train yourself and you can train others. But not to always be motivated, but to be disciplined. I've tried to chase down a source for the below comment, and forgive the language, but I've found this tumblr with the quote:
It's fickle and unreliable. It can be a burning force of a thousand suns but last only an hour. You may think you will be motivated to do something and then find out you just can't muster the energy, attention and dedication you may need. Something becomes too tough and motivation will soon depart. Motivation is for the things that you want to do, not those that you have to do to be successful.
I've recently discovered this philosophy about discipline and find it highly intriguing and forgive the irony, but it's motivating. Nobody wants to do the laborious chores of cleaning dishes, washing laundry, cutting grass, but we do it anyways because we're disciplined. And that's how people become productive - because we know we should.