At the instructions of my physicians I have finally taken up walking. As I walk, I listen to books on my IPhone. I just finished listening to Humility: The Beauty of Holiness, by Andrew Murray.
His discussion of humility is considered by some to the finest exposition of the subject. I do not if that is true but I do know that it is very fine indeed & and worth the effort to find and to listen/or read.
If one would be spiritual one must be humble, it is that simple.