Question

how do you feel that the role of ancient guru has changed in present society? which qualities of ancient guru you would like to adopt as a teacher? why?

Answer 1

When it comes to Guru - the genuine ones are Realised Masters, who have experienced the Truth of Life through direct perception of reality - the role has always been the same, whether the times are ancient or modern. They've seen the light within in all its glory & have chosen to lead seekers to realise the eternal truth. Those who aren't enlightened can at best be spiritual guides or Upa Gurus, but certainly not Guru.

The change - perceived or real - is only in the way they communicate & the customisation of methods they offer, which are aligned with the nature of human beings, at a given point in time. Such changes are only at the surface level and are necessary to wake people up from their ignorance slumber.
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Answer 2

because they had struggled and done
meditation which is a best form of concentration