मनुस्मृति - गुरु

यथा खनन् खनित्रेण नरो वार्यधिगच्छति ।
तथा गुरुगतां विद्यां शुश्रूषुरधिगच्छति ॥

- मनुस्मृति

yathA khanan kanitreNa naro vAryadhigacChati ।
tathA gurugatAM vidyAM shushShuH adhigacChati ॥

- manu smRiti

When you take a pickax and dig earth for long, you get your reward - water. If you do similar hard work at serving at teacher, you get wisdom.

- Manu Smriti