One day, a mountain asked a traveller: ‘If…’

One day, a mountain asked the wayfarer:
‘If you go up and down, up and down, when will you reach the summit?’
The wayfarer replied: ‘Every time I go down, I am coming down from the summit.
Every time I go up, I am climbing from the base.’
The mountain laughed: ‘Then there is no base, there is no summit.’
The traveller bowed and carried on walking