Authors:

You sharpen your ideas by reducing yourself to the level of the people you are with and a sense of humour and a complete relaxation, even when you're discussing serious things, does help to mobilise friends around you. And I love that.

Nelson Mandela (2011). “Nelson Mandela By Himself: The Authorised Book of Quotations”, p.198, Pan Macmillan
You sharpen your ideas by reducing yourself to the level of the people you are with and a sense of humour and a complete relaxation, even when you're discussing serious things, does help to mobilise friends around you.