Here’s an explanation.
Perhaps you’ve grown tired of your previous course or you’ve just outgrown it.
Maybe you’re just following a new desire.

Maybe it’s a testament to your selfless and giving nature.
Are you going through something particularly stressful in your life right now?
Do you feel stuck, disillusioned, and anxious?

Maybe your desire is to get away from it all.
Maybe you’ve lost the passion for your job.
Perhaps you’re desperately looking for a sense of purpose.

What you require might also be a shift in perspective (viaDream About Meaning).