Musar על שמות 22:28

מלאתך ודמעך לא תאחר. Do not delay to offer the fullness of your harvest." Rabbi Menachem Habavli explains that the Torah here tells us that when prayer is accompanied by tears, is the result of a broken heart, then G–d's response will not be delayed. It is our tradition that the "gates of tears," are never locked (Berachot 32).