The words of Sri Gaurasundara, those words that Sri Guru always repeats to us, declare that in the case of a person who does not want any personal advantage, who is inclined to serve Godhead, who is anxious to get across the ocean of the world to the further shore of the spiritual realm, for such a person to appreciate worldliness is, alas, more harmful than swallowing poison.
When Sri Guru bestows on us the mantra (which relieves one from the mental platform), in which he has been instructed by the Supreme Lord’s own, it is only then that we realize the fact that the service of the lotus feet of Sri Guru is the only cause of all well-being.
— From the lectures of His Divine Grace Srila Bhakti Siddhant Saraswati Goswami Thakur ‘Prabhupad’.