You must understand that in our system—or in any system for that matter, whether it is acknowledged or not—there are three different languages, or three ways of thinking philosophical, theoretical and practical When I say 'this is theoretical' or 'this is philosophy' in answer to a question, it means that the language is wrong You cannot ask something in a philosophical way and expect a practical answer. An abstract question cannot have a concrete answer. You must understand that the difference in meaning between these words 'philosophical', 'theoretical' and 'practical' is quite contrary to the ordinary meaning attributed to them The philosophical is the easiest approach, the theoretical is more difficult and more useful, and the practical is the most difficult and most useful of all. There can be philosophical knowledge—very general ideas, there can be theoretical knowledge—when you calculate things, and there can be practical knowledge, when you can observe and make experiments In philosophical language you speak not so much about things as about possibilities, in other words, you do not speak about facts In theoretical language you speak about laws, and in practical language you speak about things on the same scale as yourself and everything around you, that is, about facts So it is really a difference of scale.

• meaning
• language
• knowledge
• philosophy
• ideas
• experiments
• scale
• other
• matter