Above all, it's creative thinking that lies at the basis of discoveries. You must dare to think differently, see things from different sides, in order to come across fortuitous new ideas frequently. You should develop even the most stupid ideas and when you do this systematically, there will always come something useful out of it.

in De Libero van het CERN. Jaarboek 1985. Vereniging voor Technische Physica. TU Delft. p. 61.