The difference between executing ordinary religious activities and devotional service is very great. By executing religious activities one can achieve economic development, sense gratification or liberation (merging into the existence of the Supreme), but the results of transcendental devotional service are completely different from such temporary benefits. Devotional service of the Lord is ever green, and it is increasingly transcendentally pleasing. Thus there is a gulf of difference between the results derived from devotional service and those derived from religious rituals.
Source: A.C. Bhaktivedanta Swami Prabhupada (2012 edition), “Teachings of Lord Caitanya, The Golden Avatara”, Page 349