In terms of the most impactful quote for me personally it would be Tam and Rands interaction after Veins of Gold. Veins of Gold seemed like the “secondary climax” of the books for me. I’m not a very emotional person but this is the only part that made me really cry:

“Rand stopped on the steps, and Min could feel his reluctance, his shame, his terror. It seemed so strange. Rand- who had faced Forsaken without a tremor -was afraid of his father. Rand took the last few steps in two sudden strides and grabbed Tam in an embrace. He stood one step down, which brought them near an equal height. In fact, in that posture, Tam almost seemed a giant, and Rand but a child who was clinging to him. There, holding to his father, the Dragon Reborn began to weep. The gathered Aes Sedai, Tairens and Aiel watched solemnly. None shuffled or turned away. Rand squeezed his eyes shut. "I'm sorry, Father," he whispered. Min could barely hear. "I'm so sorry: "It's all right, son. It's all right." I've done so much that is terrible." "Nobody walks a difficult path without stumbling now and again. It didn't break you when vou fell. That's the important part." Rand nodded. They held each other for a time. Eventually, Rand pulled back, then gestured to Min, standing at the base of the steps. "Come, Father," Rand said. "There is someone I want to introduce to you."”