It is determined by how you feel. This idea is promoted in the media and in entertainment.
فَٱلْحَقِيقَةُ هِيَ أَنَّنَا بِحَاجَةٍ مَاسَّةٍ إِلَى ٱلْإِرْشَادِ ،‏ وَٱللهُ وَحْدَهُ بِإِمْكَانِهِ أَنْ يَسُدَّهَا .‏