Taken from aj-Jawaab al-Kaafee of Ibnul Qayyim
Written by/Said by Imaam Sufyaan ath-Thawree (رحمه الله)
Sufyaan ath-Thawree (رحمه الله) was crying from night until the morning time. When he awoke he was asked, “Was all of this crying due to fear of your sins?”
Sufyaan ath-Thawree then took a handful of straw from the earth and said, “The sins are of lesser value than this (the straw in his hand) yet I cry only out of fear from an evil ending.”
And from the greatest of understanding is that man must fear that his own sins will deceive him at the time of death so one must evade from between it (the sins) and between the evil end.