A while back i took some girls for a bracha to a Rav who came to the states from E”Y. He spoke only Yiddish or Hebrew and they spoke English so I had to translate. They also said that they daven but they don’t seem to feel their tefilos are being answered. He asked them if they would like a drink and told them to cup their hands. He was about to pour seltzer in their hands and then stopped and asked if the water would stay or drip out between their fingers?
He explained that the hands are not a vessel to hold the water because their are spaces and holes between the fingers. If the heart has holes in it, which is the lack of bitachon and emunah that Hahsem will answer their tefilos then no matter how much they daven and how much Hashem gives there is nothing to hold it, it will keep seeping out and can never be filled.