A man is as big as the measure of his thinking.
Self-confidence results, first, from exact knowledge; second, the ability to impart that knowledge.
By all means tell the world how good you are - but do it with actions, not words.
You need to recognize and sweep aside certain weaknesses which stand between you and your goals. Your persistence develops into a respected, proved, progressive power.
There is a difference between wishing for a thing and being ready to receive it.
Nature cannot be tricked or cheated. She will give up to you the object of your struggles only after you have paid her price.