If you are lacking enthusiasm, then you should rest, instead of making too much agitation within the mind. If something has dropped in the water, in the river, you cannot see the things dropped within the water by agitating the water. Just stand still for sometimes. As soon as the water is settled up, you'll see the things as they are. So as soon as our enthusiasm is agitated, it is better to sit down in any temple suitable and chant Hare Krsna. There is no question of being disappointed. After all, we commit so many mistakes. That is human nature. To err is human. That is not fault. But try to rectify with cool head.

>>> Ref. VedaBase => The Nectar of Devotion — Calcutta, January 27, 1973