Shiva Purana
निःस्पृहस्य च पूर्णस्य तस्य पूजा कथं भवेत् । शिवोद्देशकृतं कर्म प्रसादजनकं भवेत् १४ ।
If one were to ask “How can there be a self-less worship of a perfect being?” the answer is “An activity done with dedication to Śiva shall cause pleasure to him”.
english translation
niHspRhasya ca pUrNasya tasya pUjA kathaM bhavet । zivoddezakRtaM karma prasAdajanakaM bhavet 14 ।
hk transliteration by Sanscript