“Of course we all have our limits, but how can you possibly find your boundaries unless you explore as far and as wide as you possibly can? I would rather fail in an attempt at something new and uncharted than safely succeed in a repeat of something I have done”.–A. E. Hotchner
The way Arthur C. Clarke put it is “The only way to define your limits is to go beyond them”. I have also seen this written with ‘know’ and ‘discover’ in the place of ‘define’.
Checking my copy of ‘Profiles of the Future’ (Arthur Clarke, 1962) I found this “But the only way of discovering the limits of the possible is to venture a little way past them into the impossible.”
The 1973 revised edition (ISBN 0 330 23619 9) has this footnote to that statement:
"*The French edition of this book rather surprised me by calling this Clarke’s Second Law (see p 32 for the first, which is now rather well known.) I accept the label, and have also formulated a Third: ‘Any sufficiently advanced technology is indistiinguishable from magic.’
“As three laws were good enough for Newton, I have modestly decided to stop there.”