Because we have the communion of saints, we can ask all the angels and saints to pray for our intentions. Holy Mother Mary is usually our first choice. But even if the whole heavenly court prays for you and you do not pray yourself, the Lord will not hear you. So we should start praying ourselves before enlisting others for help. What God desires is a personal relationship with him. Seeking union with God is seeking that most personal relationship that pleases him the most.