My Turn, autobiography of Johan Cruyff: Johan Cruyff’s butterfly effect on Pep Guardiola

De Groot attributed part of Cruyff’s genius to his understanding of mathematics and ability to work with numbers.
Few were more unhappy when Cruyff left Barcelona than Guardiola, but as Jordi Cruyff pointed out, Cruyff was also an admirer of Guardiola and his achievements at the club.
And it was all down to the butterfly effect of working with Cruyff, said Guardiola.
“If there was one person that my father would really have wanted to be here at the presentation of his autobiography, that person is Pep,” he said, closing the event.
“I thought I knew about soccer but when I met him I realized there was a new world in front of me.

Fuente: http://elpais.com/elpais/2016/10/07/inenglish/1475841737_266201.html