When you realise the Self on which these phenomena pass, will you love or hate them? That is the meaning of indifference.

Devotee: Should we understand the world as transient (anitya)?

Ramana Maharishi:  Why so? Because you are now considering it to be permanent (nitya) the Scriptures tell you that it is not so in order to wean you from wrong ideas. This should be done by knowing yourself to be eternal (nitya) and not by branding the world as transitory (anitya).

Devotee:  We are told to practise indifference (udasina) which is possible only if the world is unreal.

Ramana Maharishi:  Yes. Oudasinyam abhipsitam. Indifference is advised. But what is it? It is absence of love and hatred. When you realise the Self on which these phenomena pass, will you love or hate them? That is the meaning of indifference.