Spiritual progress is not merely intellectual exercise. It is right living, good conduct, moral behavior. These attitudes are the automatic consequences of belief in good, just, compassionate God, who is watching and witnessing every act. So, faith in an omnipresent, omniscient, omnipotent God, is the first pre-requisite of a good life.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)