What would you attempt to do, if you knew you could not fail?

One of my old high school teachers wrote this question on the chalk board and the asked us to write our answers down. After we all wrote something he said this

"So many people are so scared to answer that question honestly, for fear that if they don't achieve whatever the answer is they'll let themselves and those around them down.

But, if you do have the confidence, and the conviction, to answer that question honestly, maybe you won't achieve what you set out to... but you'll get really far down the road just for having tried."

I have no been in high school since the 1980s and I never forgot this. So how would you answer this question?

What would you attempt to do, if you knew you could not fail?
What would you attempt to do, if you knew you could not fail?
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