Advice to one of his sons after returning from the Battle of Siffin

He wrote this letter for al-Hasan ibn `Ali1(his son - peace be upon them), when Amir al-mu'minin encamped at al-Hadirin on his way back from Siffin. From the father who is (shortly) to die, who acknowledges the hardships of the times, who has turned away from life, who has submitted himself to the (calamities of) time, who realizes the evils of the world, who is living in the abodes of the dead and is due to depart from them any day; to the son who yearns for what is not to be achieved, who is treading the path of those who have died, who is the victim of ailments, who is entangled in the (worries of the) days, who is a target of hardships, a slave of the world, a trader of its deception, a debtor of wishes, a prisoner of mortality, an ally of worries, a neighbour of grief, a victim of distresses, who has been overpowered by desires, and who is a successor of the dead. Now (you should know that) what I have learnt from the turning away of this world from me, the onslaught of time over me and the advancing of the next world towards me is enough to prevent me from remembering anyone except myself and from thinking beyond myself. But when I confined myself to my own worries leaving the worries of others, my intelligence saved me and protected me from my desires. It clarified to me my affairs and led me to seriousness wherein there was no trickery and truth which was not tarnished by falsehood. Here, I found you a part of myself, rather I found you my whole, so much so that if anything befell you, it was as though it befell me and if death came to you it was as though it came to me. Consequently, your affairs meant to me what my own matters meant to me. So, I have written this piece of advice (to you) as an instrument of seeking help through it, whether I remain alive for you or cease to exist. I advise you to fear Allah, O my child, abide by His commands, fill your heart with remembrance of Him and cling to hope from Him. No connection is more reliable than the connection between you and Allah provided you take hold of it. Enliven your heart with preaching, kill it by denial, energise it with firm belief, enlighten it with wisdom, humiliate it by recalling death, make it believe in mortality, make it see the misfortunate of this world, make it fear the authority of the time and the severity of some changes during the nights and the days, place before it the events of past people, recall to it what befell those who were before you and walk among their cities and ruins, then see what they did and from what they have gone away and where they have gone and stayed. You will find that they departed from (their) friends and remain in loneliness. Shortly, you too will be like one of them. Therefore, plan for your place of stay and do not sell your next life with this world. Give up discussing what you do not know and speaking about