Prayer has been given to us as a privilege. I believe that prayer is not to be used only in times of emergency, but is to be part and parcel of the ongoing life of the Christian. It is giving thanks, lifting up praise, as well as bringing your concerns about yourself and others to God. It's above all staying in communion with God.
I noticed that the word "persevere" is used. What might prevent us from such endurance? It might be that we simply grow weary in praying, or we believe that we cannot make a difference, or too many days, weeks, years have passed with no results. Yes, Paul's encouragement is also to us, that we would not give up on this important part of our lives.
May you persevere in your praying!