Joseph, the son of Rachel and the comfort of Jacob's old age, is a dreamer who can also interpret dreams - and Neville reads that faculty as imagination itself, so any interpreter of dreams is man's imagination. His brothers say 'behold this dreamer cometh, let us sell him, let us kill him', and Judah proposes selling him to the Ishmaelites with the passing caravan. Neville's comment is that this is what everyone in the world does with the dreamer in himself. But the dreamer rose to the heights of wealth and saved the very brothers who sold him when the famine came: the dreamer in man is what will save him.