When the candle flame flutters weakly and there is no sound on earth, it is time for us to go to sleep.
When your mind is befuddled you must concentrate and gather your thoughts together. When you feel too much tension, you must relax by putting the matter on hand aside.
The path of heavenly principles is wide. Once you set your foot on this path, it takes only a bit of hard thinking for you to become fully enlightened.