i am so ''great'' that i pointed out spelling mistake done by my teacher

he wrote ''maintainance'' instead of ''maintenance''

he was flabbergasted, and thanked me to have corrected him 

now i can relate this little incident

with 

vridha shishya, guror yuva==older one is shishya, the younger is guru == this is in shankara's ''dakshina moorthi sthothram ''

what is the message?

truth is always new and young, and valid, 

not dependent on who said , irrespective of their age, attainments 

any one may commit an error 

but the wise one corrects himself and comes on to the right track, thanking the critics for being dare and frank in their approach, not to remain in delusion ignoring the the individual's mistakes , however great one may be