Son of the Wind, ’tis thine to share The might of him who shakes the air; And,—for he loves his offspring,—he Is honoured when I honour thee. Of yore, when Krita’s age was new, The little hills and mountains flew Where’er they listed, borne on wings More rapid than the feathered king’s.

In plain words: The mountain says Hanuman shares the strength of his father, the Wind God, and honouring the son also honours the father. Then it begins a story: long ago, in the first age, mountains had wings and flew wherever they liked.