एकं शास्त्रं देवकीपुत्रगीतमेको
देवो देवकीपुत्र एव ।
एको मन्त्रस्तस्य नामानि यानि
कर्माप्येकं तस्य देवस्य सेवा ॥

Meaning:
There is only one Scripture – the Gita; There is only one God – Sri Krishna, the son of Devaki; There is only one mantra – His name; There is only on desirable action – His service.

Word meanings:
एकं = cardinal number 1;
शास्त्रं = the works or books on religion and conduct; scripture;
देवो = god;
देवकीपुत्र = Devaki’s son;
एव = alone; only; here it would mean `indeed’;
एको = cardinal number 1;
नामानि = names;
यानि = They which;
तस्य = his;
देवस्य = god’s;
सेवा = service; worship; servitude;