Understanding does not depend upon the head; it depends upon the heart. By the help of the head one can make it more clear, it becomes intelligible and one can express it better. But to begin with it must come from the heart, not from the head. Besides, a person who only uses his head says, 'It must be so because I think it is so', whereas the person who has the heart quality says, 'It is so because I believe it to be so'. That is the difference. In one person there is a doubt, in the other there is conviction. ... Spiritual attainment is nothing but conviction. ... When a person arrives at the stage when the knowledge of reality becomes a conviction, then there is nothing in the world that will change it. And if there is anything to attain to, it is that conviction which one can never find in the outside world; it must rise from the depths of one's own heart.
from
https://wahiduddin.net/mv2/VIIIa/VIIIa_4_3.htmOnce experienced belief is incidental. The stronger the experience and the more frequent the more is the motivation to continue on till it is a daily and moment to moment event. I wonder how other people could be cruel once they experience the love of God. And I have yet to understand why God keeps this away from those people who know nothing but turmoil and sadness. Is it that ego would identify with such an experience?