How does Gottfried von Strassburg use imagery in Tristan?

Imagery:

"And so the homeless boy became a favorite at court. You never saw such felicity in a child as could be seen in him. Whatever he did, whatever he said seemed (and was) so good, that all cherished friendly feelings and tender affection for him."

"A wise man, therefore, that is, one who grants woman her esteem, should keep no watch over her privacy in defiance of her own good will other than by council and instruction, and by tenderness and kindness. Let him guard her with that, and let him know this for a fact: he will never keep better watch. For whether she be vicious or good, if a man wrongs a woman too often she may well conceive a whim that he would rather be without. Every worthy man, and whoever aspires to be one, should trust in his wife and himself, so that for love of him she may shun all wantonness. However much he tries, a man will never extort love from a woman by wrong means — that is how to extinguish it. In matters of love, surveillance is an evil practice. It awakens ruinous anger and leads to a woman's downfall."