Realize this truth, my son, that the Lord who owns and holds the treasures of Paradise and the earth has given you permission to ask and beg for them and He has promised to grant your prayers. He has told you to pray for His Favors that they may be granted to you and to ask for His Blessings that they may be bestowed upon you. He has not appointed guards to prevent your prayers reaching Him. Nor is there any need for anybody to intercede before Him on your behalf.
Sometimes your prayers are turned down, and this is also in your interest; because you often, unknowingly, ask for things that are really harmful to you. If your requests are granted they will do you more harm than good and many of your requests may be such that if they are granted they will result in your eternal damnation. Thus the refusal to accede to your solicitations is a blessing in disguise to you. But very often your requests, if they are not really harmful to you in this life or in the Hereafter, may be delayed but they are granted in quantities much more than you had asked for, bringing in more blessings in their wake than you could ever imagine. So you should be very careful in asking Allah for His Favour. Only pray for such things as are really beneficial to you, and are lasting and in the long run do not end in harm. Remember, my dear son, that wealth and power (if you pray for them) are such things that they will not always be with you and may bring harm to you in the life in the Hereafter.
Be it known to you, my son, that you are created for the next world and not for this. You are born to die and not to live forever. Your stay in this world is transient. You live in a place which is subject to decay and destruction. It is a place where you will have to be busy getting ready for the next world. It is a road (to the next world) on which you are standing. Death is following you. You cannot run away from it. However hard you may try to avoid it, it is going to catch you sooner or later. Therefore take care that it may not catch you unawares or when you are not prepared for it, and no chance is left to you to repent the vices and sins committed and to undo the harm done by you. If death catches you unawares, then you are eternally damned.
Therefore, my dear son, always keep three things in mind: death, your deeds and the life in the Hereafter. In this way you will always be ready to face death and it will not catch you unawares.
My dear son, do not be carried away and be allured by the infatuations of the worldly people in the vicious life and its pleasures, and do not be impressed by the sight of their acute struggle to possess and own this world. Allah has very mercifully explained to you everything about this world. Not only the Merciful Lord but also the world has also told you everything; it has disclosed to you that it is mortal; it has openly declared its weakness, its shortcomings and its vices.
Remember that these worldly-minded people are like barking dogs and hungry and ferocious beasts. Some of them are constantly barking at others.
The losses that you suffer on account of your silence can be easily compensated but the losses which arise out of excessive and loose talk are difficult to requite. Do you not see that the best way of guarding water in a water-bay is to close its mouth.
Nobody can guard your secrets better than you. One who talks too much makes most mistakes. One who often reflects, develops his foresight.
Often medicating results in disease; sometimes diseases prove to be health preservers. Often you obtain warnings and advice from people who are not fit to warn and advise you and often you come across advisers who are not sincere. Do not rely on vain hopes because vain hopes are assets of fools and idiots. Wisdom is the name of the trait of remembering experiences and making use of them. The best experience is the one which gives the best warning and advice. Take advantage of opportunities before they turn their backs on you.
Everyone who tries cannot succeed. Everyone who departs this life will not return. The worst form of follies is to waste opportunities of this life as well as to lose salvation. For every action there is a reaction. Shortly you will get what has been destined for you.
Do good to your brother when he is bent upon doing harm to you. When he ignores or declines to recognize the kinship, befriend him, go to his help and try to maintain relations. If he is miserly with you and refuses to help you, be generous with him and support him financially. If he is cruel with you, be kind and considerate with him. If he harms you accept his excuses. Behave with him as if he is a master and you are a slave, and he is a benefactor and you are a beneficiary. But be careful that you do not thus behave with undeserving and mean persons.
Advise your friend sincerely and to the best of your ability even though he may not like it. Keep a complete control over your temper and anger because I never found anything more beneficial at the end and producing more good results than such a control.
Be mild, pleasant and lenient with him who is harsh, gross, and strict with you; gradually he will turn to your behaviour.
My dear son! After having given these pieces of advice to you I entrust you to the Lord. He will help, guide and protect you in this world and the Hereafter. I beseech Him to take you under His protection in both the worlds.
– Selections from 31st Letter of Nahj al Balagha by Imam Ali [AS], may God hallow his noble soul.