The problem with using phrases like “wholly devoted" is that we immediately think about DOING. In relation to God, man thinks he must comply with or obey the regulations and requirements of a religious faith or system in order to prove his devotion, be it prayer, Bible reading, helping the poor, etc. "Wholly devoted" applies to any faith or belief system be it Judaism, Islam, Buddhism, even atheism. In the Old Testament, devoted meant obeying the Law of Moses and fulfilling all of its requirements.
When we believe the Gospel of Jesus Christ, we tend to transfer this same thought system and apply it to our walk with the Lord. We think that if we were really, truly devoted, then our lives would PROVE how devoted we are to God. But what happens when our lives aren’t holy enough, i.e. we don't have enough proof? What conclusions can we draw? The entire premise that works is how I prove my devotion is false.
The phrase "against hope in hope" means hoping in the apparently impossible. Are you facing an "impossible" right now?