tat-puruṣa-niṣevayā

na-not; tatha-so much; hi-certainly; agha-van-a man full of sinful activities; rajan-O King; puyeta-can become purified; tapah-adibhih-by executing the principles of austerity, penance, brahmacarya and other purifying processes; yatha-as much as; krsna-arpita-pranah-the devotee whose life is fully Krsna conscious; tat-purusa-nisevaya-by engaging his life in the service of Krsna's representative.