In plain words
If one does not worship Śiva with hands that give their all, if one does not sing Hari's glory till the mouth is weary, if one does not hold compassion, Satya and the like in mind, why be born, and only bring ruin on a mother's womb?
Embodiments of the Ātma of Prema!
This is Pōtana's writing. It is the call of the cuckoo of his heart. It is a bundle holding the three yogas. It is the word of the three kāṇḍas. For those who long to cross over, this is the royal road. It is a bundle holding the essence of all Vedānta. To us it may look like no more than an ordinary verse. The endless, fathomless essence of Vedānta that is in it has been packed into three phrases. The Veda: the Vedas are endless indeed. For man, who is bound by an end, to understand the endless Veda is very hard. That is why Vyāsa divided it into three parts, named them the three kāṇḍas, held them to be the three yogas, and went on giving us the three paths called karma, upāsana and Jñāna, so that we might recognise the unity that lies within the many.
Now, if one does not worship Śiva with hands that give their all: the hands must become pure through actions such as worshipping God with them, adoring Him, offering Him pūjā and serving Him. If one does not sing Hari's glory till the mouth is weary. What was the tongue given for? For us to describe the divine and holy principle of the Ātma, and to speak with the Divine. O tongue, you who know taste and love what is sweet, I tell you what is Satya, what is good, what is supreme. He gave the tongue, bidding it offer a fitting chance to melt and move the heart of man with this Satya, with Prema, with divine words. And to remember God with the mind, the embodiment of Satya, the embodiment of the eternal, to contemplate Him and become one with Him, and to purify these sacred three instruments in man, Pōtana explained the nature of the three instruments beautifully in three phrases.
Trikaraṇa śuddhi. Trikaraṇa means mind, speech and body. Body here means the work done with the hands.