He was so assured of his salvation that he renounced all riches and became the most famous saint of the Middle Ages. Unlike Martin Luther, he had few doubts about getting into heaven. His confrontation with the world was pure joy. His name was Francesco Bernardone, known to us as St. Francis of Assisi.
He practiced severe asceticism, but forbade it to his followers, not wanting to inflict it on others. He is said to have made friends with a wolf, and the birds sang with him. To him, all Nature sang the praises of its Creator, and he composed The Canticle of the Sun.
I have asked him for advice, as I believe the Communion of Saints warrants it, even for a sinner like me. The answer I got was most satisfactory. I invite you to do the same.