Translation of the letter:
I am a will-wishing brother for you. I call you to distinguish the truth from falsehood so that you do not perish, and I invite to recognize the truthful person from a liar so that you do not remain in loss; because you have always been in loss from the first day up to now; as your Lord has said: ﴿إِنَّ الْإِنْسَانَ لَفِي خُسْرٍ﴾ and your deliverance from loss is contingent upon two things, as flying of birds in the sky is contingent on two wings, and the two things are verily faith and righteous deed; as He has said: ﴿إِلَّا الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ﴾.
But faith is to believe in the truth and disbelieve in falsehood and this is achieved only by recognizing the truth and falsehood, and but righteous deed is nothing but practicing the prerequisites of the truth and abstaining from the prerequisites of falsehood, and this also is achieved only by recognizing the truth and falsehood. Therefore, recognizing the truth and falsehood is the foundation of faith and righteous deed and these two begin with cognition. The example of cognition toward these two is the example of the foundation toward a building or head toward body or prayer toward other deeds. Does a building that does not have a foundation remain firm in its place? Or does a person who does not have head benefit from other organs of his body? Or is the Hajj and fasting accepted from someone who does not pray? In the same way if someone does not have cognition, is not faithful and his righteous deed does not benefit him.
I am telling you the truth: If someone dies in the midst of Safa and Marwa or while he is hanged from the curtains of Ka’bah with righteous deeds of all humans and jinn, while he has not recognized the truth and its people from falsehood and its people, indeed he has died an ignorant death and has gone to the hell. Therefore, it is hereby becomes obligatory upon you to recognize the truth and its people from falsehood and its people and consider this cognition prior to every righteous deed, and be aware that without this “cognition”, there is no faith for you and no prayer and fasting and Hajj and Zakat benefit you, and you will be from the losers.