(Click to enlarge photo of Srila Prabhupada)
"So there are chances of failure. There are chances of failure. Just like a great sage like Viśvāmitra Muni, he also failed, failed for the time being. But Kṛṣṇa says that this failure is not, I mean to say, unsuccessful. As we have sometimes the proverb, that 'Failure is the pillar of success,' so especially in the spiritual life, this failure is not discouraging. This failure is not discouraging.
So Kṛṣṇa says that 'Even one fails in completing his spiritual course, still, there is no loss on his part.' Pārtha naiva iha. Iha means in this world. Na amutra. Amutra means next world. Vināśas tasya vidyate: 'He will never vanquish.' Vināśas tasya vidyate, na hi kalyāṇa-kṛt: 'Anyone who takes this auspicious line of spiritual culture,' kaścid durgatiṁ tāta gacchati, 'he'll never fall down.'"
(Srila Prabhupada Lecture, New York, September 18, 1966)