Since one has reached to the level of slavery...
Since one has reached to the level of slavery, the ascension (me'raj) has become obligatory on him, and the ascension of a believer is the Salat. The Salat is comparable to a conversation between the servant and Allah (swt). The recitation of Surah al‑Fatiha and the other Surah are in actuality, a mode of speaking with Allah through the words of the Creator to the Creator.
All that which is read in the Salat including the various remembrances (adhkar) and glorification (tasbihat) is actually the servant speaking to Allah . Since Tawassul and asking for help from the Ahl al‑Bait (as) in every one of our actions is necessary, thus, when the tashahhud and salam are read, it is actually a discussion going on between the servant and the Ahl al‑Bait (as). This too is actually another form of Tawassul between the servant and Allah (swt).
Therefore, the Salat is the best thing for a servant and is the action which brings about the most pleasure. In Islam, it has been mentioned that after cognition (ma'rifah) of Allah , the Salat is the best act: أفضل الأعمال بعض المعرفة الصلاة “The best of actions after cognition (ma`rifah) (of Allah) is the Salat.” Fourth Action : The fourth act is Sa`i between the mountains of al‑Safa and al‑Marwah.