Answer:
The meaning (as I see it) is that life is hard, even sorrowful, but you must keep going.
Step-by-step explanation:
"Great Nature"--whether it represents God, natural beauty (in a romanticist sense), or something else entirely--represents uncertainty. You are at its mercy, and you must find your path by doing. The idea quite resonates with me: that while you may despair and never want to wake, you must, and you must keep moving through your day because that's how you will find your path.
If this doesn't resonate with you I'd be happy to discuss and form a different interpretation, or even explain myself better, just let me know.