"People can do more than they ever believe they can do. Physically, mentally, academically. You have to be pushed. It hurts. But it's worth it, and it's a great thing."

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You must give what will cost you something. This, then, is not just giving what you can live without but what you can't live without or don't want to live without, something you really like. Then your gift becomes a sacrifice, which will have value before God. Any sacrifice is useful if it is done out of love. This giving until it hurts - this sacrifice - is what I call love in action.

— Mother Teresa