One of the most fundamental philosophies of Praying (Salat) is mentioned in first verses of Taha holy Surah, which is: the humane beings in this world life need to be remembered (due to neglecting factors) by a means in different time periods about the God, Resurrection, call of messengers and purpose of creation to prevent him from whirlpool of neglect and unawareness, and Praying (salat/Namaz) is the best device to fulfill this duty.
When people gets up early in the morning from sleep which has made him strange from this world, decides to start his life and before anything goes to Praying, purify his heart and soul by God remembrance, empower himself/herself and is prepared for honest and purified endeavor.
When again he is sank in daily life and some hours are passed, maybe his link with God is cut, suddenly it is noon, midday, and he hears the call of Muezzin: God is Great….. Come to pray! God is the Greatest, he is ascendant of any description, hurry to Praying!. So he goes for Praying and adores in front of his lord and washes any dust of neglect which has covered his heart. This is the point which God orders Muses in the beginning of the revelation that: stand up for praying to remember me!
It is interesting that the verse says: stand up for praying to remember me! But in the verse 28 of Ra'd Surah says: now surely by Allah's remembrance are the hearts set at rest. And in verses 27 to 30 of Fajr holy Surah says: O satisfied soul, return to your Lord well-pleased, well-pleasing. Join My worshipers and enter My Paradise!
By placing these three verses beside each other we can understand that praying keeps human beings in remembrance of God and this remembrance gives him/her Reproaching soul (satisfies soul) and this kind of satisfies soul reaches to permanent paradise and status of especial servants.