A quote that I think even the relativists in the room might appreciate, from G.K. Chesterton’s wonderful little book Orthodoxy:
Any one setting out to dispute anything ought always to begin by saying what he does not dispute. Beyond stating what he proposes to prove he should always state what he does not propose to prove. The thing I do not propose to prove, the thing I propose to take as common ground between myself and any average reader, is this desirability of an active and imaginative life, picturesque and full of a poetical curiosity, a life such as western man at any rate always seems to have desired. If a man says that extinction is better than existence or blank existence better than variety and adventure, then he is not one of the ordinary people to whom I am talking. If a man prefers nothing I can give him nothing. But nearly all people I have ever met in this western society in which I live would agree to the general proposition that we need this life of practical romance; the combination of something that is strange with something that is secure. We need so to view the world as to combine an idea of wonder and an idea of welcome.