Here's some more graphics by Tomasz Steifer to support International Heraldry Day on June 10.
What is it that induceth you, what stirs you up to believe, or who told you that white signifieth faith, and blue constancy? An old paltry book, say you, sold by the hawking pedlars and balladmongers, entitled The Blason of Colours. Who made it? Whoever it was, he was wise in that he did not set his name to it. But, besides, I know not what I should rather admire in him, his presumption or his sottishness. His presumption and overweening, for that he should without reason, without cause, or without any appearance of truth, have dared to prescribe, by his private authority, what things should be denotated and signified by the colour: which is the custom of tyrants, who will have their will to bear sway instead of equity, and not of the wise and learned, who with the evidence of reason satisfy their readers. His sottishness and want of spirit, in that he thought that, without any other demonstration or sufficient argument, the world would be pleased to make his blockish and ridiculous impositions the rule of their devices. - Rabelais