Hazrat Mufti Ebrahim Salejee (Daamat Barakaatuhu) mentioned:
In matters of deen we need to have a guide. The Mashaayikh state that the one who does not have a guide for his deeni matters then Shaytaan will become his guide and lead him. When this happens then one will go astray.
Ihyaaud Deen An Effort to Revive Deen in Totality