I was hit by an 8-week spell of depression out of the blue in 1978 and i've never forgot it, it was as if waves of despair and the hopelessness of human existence kept flooding my brain and the whole world seemed cold and dark, and for the first time in my life I seriously began to consider whether "demons" had got in my head.
I was very down but not quite suicidal, and began reading the Bible more to find something to convince me that life wasn't meaningless, and gradually the depression lifted and hasn't been back.
I kept up the Bible reading and grew stronger and stronger over the years..
PS- if it's any comfort to Williams fans, the Bible does NOT say suicide is a sin despite what some organised religions try to say.