The world has no substance of its own. It is simply a vast concordance of causes and conditions that have had their origin, solely and exclusively, in the activities of the mind that has been stimulated by ignorance, false imagination, desires and infatuation. It is not something external about which the mind has false conceptions; it has no substance whatsoever. It has come into appearance by the process of the mind itself, manifesting its own delusions. It is founded and built up out of the desires of the mind, out of its sufferings and struggles incidental to the pain caused by its own greed, anger, and foolishness. People who seek the way to Enlightenment should be ready to fight such a mind to attain their goal.
The Way of Practical Attainment
The Teaching of Buddha, p. 304
Bukkyo Dendo Kyokai