‘Nobody’s Invincible, Nobody’s Immune To Mistakes’

Needless to say I agree completely with this sentiment as expressed by Boris Gelfand. And it’s very important to believe this when entering any contest either as the underdog or the favourite:

Very many chess games are lost either by a player being overconfident or cowering in terror. The right approach is to steer a steady course between these extremes and adopt Lasker’s approach of a kind of ‘cheerful pessimism’.