How great?

I found a discarded fortune cookie slip, which said, "What great things would you attempt if you knew you could not fail." (sic)
My first thought was the saying, "With God, all things are possible." Then the enormity of that statement dawned on me. With God, all things are possible, INCLUDING FAILURE. God does not prevent us from failing, if that might be helpful to our growth.
So, the question as to what we might attempt if failure were not an option is unanswerable. It follows, too, that we need not wait for failure to not be an option in order to attempt great things.
Of course, then it comes down to fear, which is at the core of the whole failure concept.
And we all know the answer to that! LOVE! Now that's a great thing!