What is thought ?

Thought or thinking is only a sensation which we have got used to, because it gives a sense of existence ! But after directly seeing the limits of thought or thinking or limits of mental life, we discover Pure Consciousness as our Real Existent Self, then we can gradually abandon the seeking of existence through thought and settle as the Real Existent, Consciousness, Blissful Self ! Then, at last, after eons of struggle, one is free from the prison of thought !