The Yaksha asked, ‘What is weightier than the earth itself? What is higher than the heavens?’ What is fleeter than the wind? And what is more numerous than grass?’ Yudhishthira answered, ‘The mother is weightier than the earth; the father is higher than the heaven; the mind is fleeter than the wind; and our thoughts are more numerous than grass.’

In plain words: Yudhishthira says a mother is weightier than the earth and a father higher than the sky. The mind is faster than the wind, and our thoughts are more numerous than blades of grass.