If a person wants to learn any art form or gain knowledge/science he will seek help from an expert in that field. Knowledge of Allah Ta’ala’s Zaat (Being) is the most difficult secret in the universe. It can only be achieved with the help of its experts, the Awliya Allah. Only these people can be accepted as Murshids (guides). The following quotation define the need and guidance of a Murshid.

Ghausul A’zam, Hazrat Sheikh Abdul Qaadir Jailani (radi Allahu anhu) brings home the necessity of a Murshid in a beautiful metaphor. He says: "The heart is the plantation for the Aakhirah (Hereafter). Sow the seeds of Imaan in your heart. Irrigate, fertilise and mature it with regular good deeds. If there is kindness and energy in the heart it will be fertile and an abundant harvest will result. Should the heart be harsh and contemptuous, the soul becomes infertile and barren and no crop will be able to grow. Learn this art of farming by its farmers/experts, the Awliya Allah.

Do not think your opinion to be sufficient. Our Prophet (sallal laahu alaihi wasallam) says, ‘Seek help in every field from an expert in that field’". (Al-Fath-ur-Rabbani, pg. 202).
Ghausul A’zam (radi Allahu anhu) said: "Arrogance, hypocrisy, egoism, are all arrows of Shaitaan aimed at your hearts. One should formulate a strategy to defend oneself from this attack. The correct strategies are explained and demonstrated by the Mashaa’ikh (Guides). You should heed to their commands and act on them. They will guide you on the path of Allah since they have already travelled on this path. Ask their advise on matters relating to the Nafs (carnal desires), cravings and other weaknesses because they have also suffered their consequences and are well aware of the dangers and harms of evil desires. They have battled these over a long period of time and can confront, control and defeat them". (Al-Fath-ur-Rabbani, pg. 150)