Once I built a castle in the air,   A home for you and I-   In a blue, blue sky.   We'd leave behind the weight of worldly care,   I thought we could fly   We only had to try.      Ah, I had to learn fast, (For your own good)   I had to learn fast   And when I knew at last (You understood)   I knew at last      Hell and heaven can be one and the same,   If you don't know how   You should know by now,   Every pleasure always holds an equal amount of pain   But it all works out,   I have no doubt.      Ah, we had to learn fast, (For our own good)   We had to barn fast.   And when we knew at last (When we understood)   We knew at last      Every kite has got to have a string for it to fly   Up to who knows where ?   Castles in the air.   So there are strings attached to you and I   Though they hold us tight   We can take flight.