Sentence:  This is well evidenced by the Quietist doctrines carried over in Zen : the idea of the inward turning of thought , the enjoinder to put aside desires and perturbations so that a <WSD>return</WSD> to purity , peace , and stillness - a union with the Infinite , with the Tao - could be effected . 
Meaning of the word marked with <WSD> tags:  go or come back to place, condition, or activity where one has been before