Speaker: Srila Prabhupada
Source: Teach What Krsna has Said

So we have to follow mahajana because we are tiny living entities. We cannot speculate. This is nonsense. Speculation is nonsense. Panthas tu koti-sata-vatsara-sampragamyo vayor athapi manaso [Bs. 5.34]. If we speculate we shall never reach the Absolute Truth. That is not possible. But power is very limited. How long I shall speculate? This is called kupa-manduka-nyaya. Just like a frog in the well is informed by his friend, “My dear friend, Mr. Frog, or Dr. Frog, I have seen