Imaam Ibnul Qayyim (rahimahullaah) said:

The greatest type of reliance upon Allaah is: Reliance upon Allaah in (seeking) guidance; establishing Tawheed; adhering to the path of the Messenger (sallal-laahu-alayhi-wasallam) and striving against the people of falsehood. This is the Tawukkul of the Messengers and particularly that of their (true) followers.

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[Al-Fawaa’id…page: 138]