And when you are journeying in the land of preparedness along the path of knowledge in pursuit of certainty, you would not be at fault if you shorten, that is, [if] you curtail the corporeal deeds and the fulfilment of the duties of servanthood (ʿubūdiyya) such as gratitude and presence, for the Prophet, blessings and peace be upon him, said, 'Whoever has been given his [full] share of certainty, let him not be [overly] concerned with what he has missed of prayers and fasting', if you fear that you may be afflicted, that you may be deceived and led astray, by those who do not believe, that is, [by] those that have been veiled such as the faculties of estimation and imagination and the human devils who are astray and who lead [others] astray, given what we know from the words of the Prophet, 'A single man of [deep] understanding is more difficult for Satan [to lead astray] than a thousand worshippers'.