Then said Pravâhana Gaivali to Silaka Sâlâvatya: 'Your Sâman (the earth), O Sâlâvatya, has an end. And if any one were to say, Your head shall fall off (if you be wrong), surely your head would now fall.' 'Well then, let me know this from you, Sir,' said Sâlâvatya. 'Know it,' replied Gaivali.

In plain words: Then Pravahana told Silaka that his answer, the earth, also has an end, so it cannot be the final source. Silaka humbly asked Pravahana to teach him, and he agreed.