We normally ask for the many spiritual qualities, such as faith, perseverance, patience, etc., we think we need. This approach is relatively self-centered ~ we focus upon what we think we lack ~ and involves more of a struggle on our part.
I believe that a superior approach is to rest in God with abandonment. We lie open before him, letting him see what we need and fill us. The focus is mainly on him and not us. Again, save our energy and tap God's power, for he is infinitely greater and wiser.