Hakeemul Ummah Hazrat Moulana Ashraf Ali Thaanwi Sahib رحمه الله has said that everyone, even the great ones (Ahlullāh) experience wasaawis (stray thoughts). Do not be concerned. Be totally unconcerned even if the Nafs and Shaitān cast thousands of wasaawis. Shaitān strives to render a person hopeless with these stray thoughts. Just ignore them; the plot of Shaitān is to render you hopeless with the deluge of wasaawis (stray thoughts).
(SOURCE: MALFOOZAAT OF HAZRAT MOULANA ASHRAF ALI THAANWI SAHIB رحمه الله, PART 6)