Full Idea
Who everywhere is free from all ties, who neither rejoices nor sorrows if fortune is good or is ill, his is a serene wisdom.
Gist of Idea
Serene wisdom is freedom from ties, and indifference to fortune
Source
Anon (Bhag) (The Bhagavad Gita [c.500 BCE], 2.57)
Book Reference
'The Bhagavad Gita', ed/tr. Mascaro,Juan [Penguin 1962], p.53
A Reaction
This is very similar to the 'apatheia' of the Stoics, though they are always more committed to rationality. This is quite a good strategy when times are hard, but as a general rule it offers a bogus state of 'wisdom' which is really half way to death.