The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.
I posted a similar saying by Dr. Ferdinand Porsche who summerized it in a different but succinct way.
The net of it is don’t be lazy, don’t underestimate your goals or ability and for Pete’s sake, try harder. You’d be amazed at what you can achieve.
I read from the Navy Seals that no matter how exhausted you are, you still have about 60% more to give.