In her opinion her singing falls on deaf ears anyway; there is no lack of enthusiasm and applause, but she has long since given up hope of genuine understanding as she conceives it.
enthusiasmquotes
The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm.
Our age is essentially one of understanding and reflection, without passion, momentarily bursting into enthusiasm and shrewdly relapsing into repose.
enthusiasm / Passion / reflection / repose / understanding