Because to define it it refers to reality to events to what actually happened or is absolutely certain to happen. This is all pretty nebulous. And what is a lie after all Just the untruth The Oxford dictionary says roughly the same. What is true “The actual facts in relation to a situation event or person. A fact or proposition held to be true by the majority. Again it doesnt help us. The only thing certain is that we are not referring to a divine truth by revelation whose source and limits are predetermined. As for lying the Oxford dictionary notes To say or write something that is not true with the intention of deceiving someone. But since truth is not precisely defined how is it so certain what a lie is The French are always more labyrinthine and often more enigmatic.
In their very good dictionary Robert they write the following more mysteriously as if to underline the complexity of the problem. What is true following a relation of identification with the object of thought an inner coherence of thought. Coherence to photo background removing which the greatest value is attached as opposed to error illusion. A circular attempt at definition is attempted in this case. That is there must be a relationship of identification with the object of our thought. An inner coherence of thought. And this thought has great value. Contrasted with error he doesnt lie he tells with error and illusion. As for the Lie A claim knowingly contrary to the truth which is done with intent to deceive.
Lying it seems is easier to define because it contains malice meaning that we tell a lie deliberately and with the aim of deceiving. But here the French complicate things because they say that error and illusion is a kind of lie since it is not the truth. I referred to the above definitions of course not to end up adopting any of them but to make it clear that the quotation of the two words truth and lie counts more than what we are used to doing in our daily lives by bringing the truth against the lie where one word annihilates and negates the other. The problem certainly arises from the moment that at least in our culture there is no given and absolute content for the word truth.