From this page:
David Godman explains his memories about Nisargadatta Maharaj
"I remember one woman asking him, rather innocently, 'I thought enlightened people were supposed to be happy and blissful. You seem to be grumpy most of the time. Doesn't your state give you perpetual happiness and peace?'
He replied, 'The only time a jnani truly rejoices is when someone else becomes a jnani'.
Harriet: How often did that happen?
David: I don't know. That was another area that he didn't seem to want to talk about."
(bolding is mine)