Allaah (The Most High) said:

[وَٱعۡتَصِمُواْ بِٱللَّهِ هُوَ مَوۡلَٮٰكُمۡ‌ۖ فَنِعۡمَ ٱلۡمَوۡلَىٰ وَنِعۡمَ ٱلنَّصِيرُ]

”And hold fast to Allah; He is your Maula (Patron, Lord, etc.), what an Excellent Maula (Patron, Lord, etc.) and what an Excellent Helper!” [1]

Imaam Ibnul Qayyim (rahimahullaah) said:

When you hold fast to Allaah, Allaah will protect you.  Allaah will help you against (the evil urges) of your souls and shaytaan. These are two enemies that do not separate themselves from a slave (of Allaah). Their enmity is more harmful than an outside  enemy. Therefore being given help against them is the most important thing and a slave (of Allaah) is more in need of this (than other things).  And the completeness of this help (against the urge of the evil self and shaytaan is obtained) in accordance with one’s (level) of attachment to Allaah. [2]

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[1]Soorah Al-Hajj. Ayah 78]

[2]جلاء الأفهام  page: 154]