Means when you have some motive behind doing anything and it have a deep sense of alignment within your thought and action and later result.

To keep yourself motivated you have choose the best motive or purpose to do the things.

Right motives always provide you an opportunity to discover yourself more deeper ,powerful way and giving new perspectives and provide to build your greater version.

Keep yourself self motivated always frame yourself to get new exposure , explorations and new learning with bigger cause .

One can be motivated by different way but I think nature is the best source to keep yourself motivated always by adopting its simple law of giving without any expectations and doing great for entire humanity.