Imaam Ibnul Qayyim [rahimahullaah] said:

The greatest type of reliance upon Allaah is: Reliance upon 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 Tawakkul of the Messengers and particularly that of their [true] followers.