(pertaining to our changing moods through the journey of life; wherever we are....sometimes we feel high, sometimes low, sometimes sad, sometimes happy and sometimes neutral - neither happy nor sad; our changing moods influence our thoughts and actions)
From hither to thither in the above poem signifies - from here (the beginning of life) to there (the end of life)
I've perceived our various moods as the various flowers which blossom and wither in the course of their life.
