Imaam Ibnul Qayyim (rahimahullaah) stated:

”The greatest of reliance and trust in Allaah, is reliance and trust in Allah (whilst) seeking (His) guidance, actualizing Tawheed, following the Messenger (sallal-laahu-alayhi-wasallam) and striving against the people of falsehood.  This is the reliance of the Messengers and (that of their true) followers.” [Al-Fawaa-id. Page.138]