Prabhupāda: Saṁsāra-dāvānala-līḍha-loka. The whole world is blazing, and just like in the blazing fire of the forest, the animals are going here and there, and some of them are dying, the whole world is like that. And how that blazing fire can be extinguished? You cannot send there this fire brigade, or you cannot get some pots of water and try to extinguish that wide fire. It is not possible. Then how to extinguish it?
The extinguishing is possible when there is cloud overhead and there is incessant pouring of water. Then the forest fire extinguished. No artificial means, no scientific means. Fire brigade or this fire extinguisher, we have invented so many things, but when there is forest fire all these things are nonsense. Nothing can be used. The only use, means, is when there is pouring, incessant pouring of water from the cloud. That is made of God. That is not in your hand. You cannot produce cloud. Some arrangement of God's arrangement, the cloud, is there. Ghanāghanatvam. The example is given, "Charitable just like the cloud." Why this example is given? When cloud pours water, it is so sufficient that there is no comparison. But if you want to pour water, a bucketful of water, how long you will do it?
So spiritual master means he must be just like the cloud. How it is possible? It is possible. It is possible in this way, provided he follows the disciplic succession of spiritual master. Then it is possible. He must inherit the power from the superior source. Then it is possible that by his teaching, by his lessons, the forest fire which is burning within our heart, it can be extinguished, and the person who receives such spiritual instruction bona fidely, he becomes satisfied. This is the process.
(Srila Prabhupada Lecture, Hamburg, September 5, 1969)