Waiting for Godot is a play driven by a lack of truth – in other words, uncertainty. Characters are unable to act in any meaningful way and claim this is so because they are uncertain of the consequences. Without the presence of objective truth, every statement is brought to question, and even common labels (color, time, names) become arbitrary and subjective.
In Waiting for Godot, Beckett espouses the Existentialist tenet that the world is without meaning, but disagrees with the belief that one can give the world meaning and purpose through action.