उपमितिभवप्रपंच - कूपमण्डूकः

यो न निर्गत्य निःशेषां विलोकयति मेदिनीं |
अनेकाद्भुतवृत्तांतां स नरः कूपदर्दुरः ||

- उपमितिभवप्रपंच

If a person never gets out of his home (home town) and sees the world full of surprises, then he is to be considered as a frog in a well.

- Upamitibhavaprapancha