Samadhi is eternal, if not how can it be real?

Devotee:  Do not men go into samadhi?

Ramana Maharishi:  Is there no samadhi now?

Devotee:  Is it eternal?

Ramana Maharishi:  If not, how can it be real?

Devotee:  Then?

Ramana Maharishi:  There is no then, no now.

Devotee:  It appears so.

Ramana Maharishi:  To whom?

Devotee:  To the mind.

Ramana Maharishi:  What is mind? Who am I?

Devotee:  (Silence).