You cannot prove realism to a complete sceptic or idealist; but you can show an honest man that he is not a complete sceptic or idealist, but a realist at heart. So long as he is alive his sincere philosophy must fulfil the assumptions of his life and not destroy him.
George SantayanaWhat better comfort have we, or what other Profit in living Than to feed, sobered by the truth of Nature, Awhile upon her beauty, And hand her torch of gladness to the ages Following after?
George Santayana