The Two Sides of the Well

Do tears come from a well? We can never tell But they never seem to dry As much as I can try They keep flowing down Changing the smile to a frown I hate tears of pain Longer than the longest train Does happiness come from a well? Heaven even in hell It never seems to end Supplier keeps to send Even the bitter as bile Will change the frown to a smile I love tears of joy Longer than the longest pain