You see: there are three types of knowledge. The first is intellectual knowledge – the knowledge of the mind. For this, you need only your mind, nothing else. If you are attentive and have a good memory, it is enough. If you can apply logic well, if you have a little common sense to connect things and understand, it is enough. This is the kind of knowledge that you gain in school, with your books. To learn mathematics and science, your mind is enough. You can become a great mathematician or a great scientist.