( Story told by Swami Vivekananda )
In the history of each nation, you will always find that only those individuals who have believed in themselves have become great and strong. Here, to India, came an Englishman who was only a clerk, and for want of funds and other reasons he twice tried to blow his brains out; and when he failed, he believed in himself, he believed that he was born to do great things; and that man became Lord Clive, the founder of the Empire. If he had believed the Padres and gone crawling all his life —’O Lord, I am weak, and I am low’—where would he have been? In a lunatic asylum. You also are made lunatics by these evil teachings. I have seen, all the world over, the bad effects of these weak teachings of humility destroying the human race. Our children are brought up in this way, and is it a wonder that they become semi-lunatics?
This is teaching on the practical side. Believe, therefore, in yourselves, and if you want material wealth, work it out; it will come to you. If you want to be intellectual, work it out on the intellectual plane, and intellectual giants you shall be. And if you want to attain to freedom, work it out on the spiritual plane, and free you shall be and shall enter into Nirvana, the Eternal Bliss. (CW, 3:427)
Source: The Complete Works of Swami Vivekananda/Volume 3/Lectures from Colombo to Almora/The Vedanta