We see the night and the day but we do not understand that there must be a third force between them. Always we must seek the third force. Living constantly in the pairs of opposites puts us to sleep. Gurdjieff said that men are third-force blind, but if you listen to the birds when dawn comes or dusk falls, you will hear the third force, if you have ears to hear. People can live their entire lives without hearing it even once, but it is there to be heard every day. The birds know the third force.