Is making du'a through the means of the pious (tawassul) permissible?

“Tawassul literally means, to make a request or supplicate through some means. It is permissible for one to request Allah Ta’ala to accept one’s Dua through the medium of some deeds, or the rank of certain individuals, as this may be closer to acceptance.”

“Tawassul (Waseela); whether it is done through the medium of the living, the dead, their beings, their actions, a person’s own actions or someone else’s actions; in all these instances the truth of the matter is that Tawassul in reality is done by drawing the Rahmat (Mercy) of Allah Ta’ala, i.e.”

“A person can supplicate directly to Allah Ta῾āla without any intermediary and without the intercession of anyone. Allah Ta’ala says: “And when my servants ask you about Me, of course, I am near. I respond to the call of one when”

“Tawassul (using intermediaries in supplication to Allah) through the Prophet (Allah bless him & give him peace), Awliya and righteous believers is permitted, rather recommended according to the four schools of Sunni Islam.”