Ahí lo dejo

Estoy haciendo la tarea de inglés y acabo de toparme con un fragmento que me ha llamado la atención dentro de un texto que tengo que leer. Se trata de una anécdota de Kofi Annan:

I was one of a group of boys who sat on the floor of our proffesor's office for our weekly lesson in spoken English. One day the professor put a large sheet of white paper on the wall. The paper had a little black dot on the right-hand corner. When the professor asked, 'Boys, what do you see?' we all shouted together 'A black dot!' The professor stepped back and said, 'So, not a single one of you saw the white sheet of paper. You only saw the black dot. This is the awful thing about human nature. People never see the goodness of things, and the broader picture. Don't go through life with that attitude.'

Ahí lo dejo.