TO worship God even for the sake of salvation or any other reward is equally degenerate. Love knows no reward. Give your love unto to God, but do not ask anything in return even from Him through pray.
Swami Vivekananda (2015). “Bhakti Yoga: The Yoga of Love and Devotion”, p.72, Advaita Ashrama (A publication branch of Ramakrishna Math, Belur Math)