his saying as for that which ascends from it it pierces the veil and penetrates it. as for the answer to this ascending vein piercing the veil it is because it needs to penetrate to the upper parts of the body and to the heart and the veil is placed between the organs of nourishment and the organs of respiration. therefore this vein is only able to penetrate to the heart and its regions after penetrating the veil and that is by piercing it and penetrating into it. and it is necessary that at the place of its piercing it there is strong contact with the veil because if it were to be a little aloof from it the breath would come out of the gap between them and penetrate to the organs of nourishment and that would be very harmful.
قوله وأما الصاعد منه فيخرق الحجاب وينفذ فيه وأما جواب خرق هذا العرق الصاعد للحجاب فلأنه يحتاج إلى النفوذ إلى أعالي البدن وإلى القلب، والحجاب موضوع بين آلات الغذاء وآلات التنفس فلذلك إنما يتمكن هذا العرق من النفوذ إلى القلب ونواحيه بعد نفوذه إلى الحجاب، وذلك بأن يخرقه نافذا فيه. ولا بد وأن يكون عند موضع خرقه شديد الاتصال بالحجاب إذ لو كان متبرما عنه ولو بقدر يسير لكان النفس يخرج من الخلل الذي بينهما وينفذ إلى آلات الغذاء وذلك فيه ضرر عظيم.