Decorating your heart
Nischintya: The pujari in Hawaii had put banana leaves, mounds of tulasi and flowers on the altar and when Srila Prabhupada began his lecture, he commented on how beautiful the Deities were and how the pujari had done a wonderful job. Prabhupada said, “You must decorate the Deities very nicely. By decorating the Deities, you are decorating your heart.” Everyone was ecstatic. Then in a grave voice Prabhupada said, “If you neglect decorating the Deities, you will neglect decorating your heart. Then your heart will become black. And that is why so many have left.” At that point, everybody got nervous.
Source: Remembrances by Sidhanta Das – Folio Vedabase