If we long to have (more) spiritual sight and insights, we must be prepared that God will take us through many, many severe sufferings. Who wants this? Surely, our old nature hates suffering. And this is why God takes us through these things. He knows that our new spiritual nature that is opposed to the flesh will finally come out victoriously. Below I offer you an excerpt from T. Austin Sparks’ writings that deals with the topic I have just touched on. Sparks described here the cause of spiritual blindness that both springs from our old nature and Satan’s work in our soul.