Is writing letters to God Almighty as a form of intimate supplication permissible in Islamic law?

If the purpose of writing letters is to record articles or supplications that include humble entreaty to Allah and praise of Him, then there is no harm in that. Rather, it is considered a form of remembrance (dhikr) and supplication (du'a), which are the essence of worship and drawing closer to Allah, and the one who does so is worthy of Allah's love and the answering of his prayers. Allah Almighty says: "And when My servants ask you, [O Muhammad], concerning Me - indeed I am near. I respond to the invocation of the supplicant when he calls upon Me. So let them respond to Me [by obedience] and believe in Me that they may be [rightly] guided" (Al-Baqarah: 186), and Allah Almighty says: "And your Lord says, 'Call upon Me; I will respond to you'" (Ghafir: 60). Writing this only serves to emphasize it, and there is no difference between writing it and uttering it. The books of the ancients are full of their intimate prayers and supplications.