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Challenge can be inspiring only when you are able to meet it. Please don't tell me that you feel euphoric when things are not going your way. People who say that challenges drive them usually have a lot of sleepless nights lying on a pillow drenched in their tears.

The euphoria comes after having faced the challenge. And I actually am a pretty sound sleeper...
I also wouldn't say a challenge is when things are not going my way. It's also not that I search for challenges. Yet, I do try to push my own boundaries, learning and being amazed along the way. And yes, that is awesome.