Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes. Genuine ignorance is profitable because it is likely to be accompanied by humility, curiosity, and open-mindedness; whereas ability to repeat catch-phrases, cant terms, familiar propositions, gives the conceit of learning and coats the mind with varnish waterproof to new ideas.
Success tends to go not to the person who is error-free, because he also tends to be risk-averse. Rather it goes to the person who recognizes that life is pretty much a percentage business. It isn't making mistakes that's critical; it's correcting them and getting on with the principal task.
Where there is a will there is a way. is an old true saying. He who resolves upon doing a thing, by that very resolution often scales the barriers to it, and secures its achievement. To think we are able, is almost to be so -- to determine upon attainment is frequently attainment itself.