Som quote about the "career" of the soul after death, taken from
Imam Ibn al-Qayyim writes in "Kitab al-Ruh" about how the strength of souls can increase after a person's death:
Imam al-Razi writes on this subject:...one should know is that what we have mentioned regarding the soul is relative to the individual souls’ power, weakness, bigness, and smallness. So the great and large soul has among what we have mentioned what the lesser soul does not have, and you can see how the rules of the souls differ greatly in this world according to the souls’ differences in modality, power, slowness, speed and getting help…….. This is how it was while captivated in its body, so how would it be if it became independent and departed from the body, and its powers were gathered, and it was at the outset a lofty, pure and big soul with high sense of purpose??? This soul has after the departure a whole other importance and other actions. In this regard dreams have been collaboratively mass narrated among human kind about the actions of souls after their death, actions they were not able to do while in their bodies, such as one, two or a few souls defeating entire armies and the like. Very many people have seen the Prophet with Abu Bakr and ˆUmar in their sleep having defeated the armies of kufr and injustice, and then their armies are overwhelmed and crushed despite large numbers, and the weakness and small numbers of the Muslims
In his Tafsir of Surat al-Nazi3at, Ayah 7 "فَالْمُدَبِّرَاتِ أَمْرًا” - he writes about the souls "saling" towards Alllah:Those souls that left their bodies are stronger in some ways than those that are still attached to bodies, and vice versa. As for the souls having left being stronger in some aspects; this is because when they left their bodies, the veil was removed. The world of the unseen and the dwelling places of the afterlife thus became apparent to them. The knowledge that had previously been based on proofs, became observable reality after leaving the body….Consequently they reached a certain kind of perfection.” He continued stating that the souls attached to their bodies are stronger in that they still have the tools for seeking and acquiring, and are gaining new knowledge every day.
If a person went to the grave of someone with a strong soul, complete in essence, strong in influence, and stood there for a while, and was influenced by the soil there – the soil that the soul of the dead is attached to – then a mutual attachment occurs between these two souls due their gathering on that soil. They become like two polished mirrors reflecting each other’s rays; all that has been acquired in the visitor’s soul of proof-based knowledge, knowledge gained from effort, and high morals like submission to Aļļaah, and being content with what Aļļaah has predestined, reflects a light that travels to the soul of the dead host. Likewise, all the knowledge that has been acquired in the dead person’s soul of radiating and complete knowledge reflects light that goes to the soul of the living visitor. In this way this visit is a cause for the occurrence of great benefit and happiness for the soul of the visitor as well as that of the host. This is the basic reason for the religious prescription of visiting graves. It is also not unlikely that there are other secret events that are more subtle and deep than what has been mentioned here. Complete knowledge of the real nature of things is something Aļļaah only has.
Imam Sa3d al-Din al-Taftazani, anohter great Shafi'i scholar, wrote in his "Maqasid":There is no question that the faster souls are more noble, so it is not strange that Aļļaah swore by them (in the Aayah above). In addition, these noble and high souls, are not unlikely to have in it what has an apparent effect on this world, due to its strength and nobility. Accordingly, they are:
Literal interpretation: “…and by the conductors (as created causes) of (worldly) matters.”
Isn’t it true that the human being might see his master teacher in his dreams, asks him about a problem, and then gets guidance from him to its solution? Isn’t it true that a son may see his father in a dream guiding him to a hidden treasure? Isn’t it true that Galen said, “I was sick and unable to treat myself. Then I saw in my dreams someone that gave me guidance towards the way of treatment.” Isn’t it true that Al-Għazaaliyy said, “Noble souls, when they leave their bodies, and happen to meet someone <alive> similar to them in body and soul, are not unlikely to become attached to this <person met’s> body. This to the extent that it becomes an aid to the soul of that <live> person in doing good deeds, and then that aid is called “intuition”. Its equivalent for mean souls (i.e. Devil Jinn, not dead people, because they are tortured in their graves) is evil whispers in the mind.”
“What is apparent from the principles of Islaam, is that there are renewing perceptions of parts for the soul after leaving the body as well as looking at some parts of the lives of the living, especially of those that had a relationship with the dead person in this world. This is why there is benefit in visiting graves, and seeking support from the souls of the pious that have died in terms of seeking experiences and fending off weariness. This is because the soul after leaving the body is attached to the body and the soil it was buried in. So if the living visited this soil and faced the soul of the dead person, then there will be an attachment between them and streams <of light>.”