Harry's testimony at Ginny's trial was recorded word for word in the Daily Prophet and was something that went down in history. It was taught in schools. It was mandatory reading for all potential aurors. It made an impact on the way people thought.
He thought about it long and hard before hand. He prepared it carefully. He memorized it and delivered it flawlessly.
"This is what I have learned," he began, "from this young woman. If you do not understand the relevance of my testimony as I begin, please hear me out and it will be made clear.
"I have learned the importance of seeing someone for who they are rather than who they appear. I have learned the necessity of putting forth effort to know someone before judging him. I stand here today for no reason beyond her knowledge of one I believed to be my enemy, a man she knew to be my ally.
"I have learned the importance of trusting the heart. I have learned the importance of trusting the soul. I have come to believe in observation and intuition. She never had what we would consider a real conversation with him, she never heard him declare his allegiance, but she did know him, and her trust in him was based on that knowledge.
"I have learned the importance of trusting the judgement of those I love, of those I trust. I never doubted her in anything until I learned she trusted Draco Malfoy. I doubted her in that for no reason beyond my own mistrust of a man I never truly got to know.
"I have learned the importance of standing for what one believes. I have learned what it truly means to risk everything for one you love. She knew what would happen if he was convicted and yet she testified anyway. She knew the risk, and yet she took it because she refused to believe she had a choice. In her mind, knowing that he was right, deserving of freedom and even honour, obligated her to testify. She never would have been able to live with herself had she left him to his fate without attempting to help him. That much she would do for anyone whether she cared for him personally or not. That much her conscience would demand. The fact that she genuinely cares for him effects only her heart.
"She was not my only teacher. Hermione Granger, Bill Weasley, Remus Lupin, and Severus Snape have also given me a lesson in loyalty and integrity. They have stood beside her throughout this entire ordeal. They refuse to let her suffer for doing that which is right, at least not alone. They have no reason, no obligation to her beyond their affection and personal concern. They are laying everything on the line and that has taught me what true honour and nobility really is.
"I now stand, admittedly too late, in support of my friend. I have come to trust her judgement. I regret that I did not stand beside her when she first brought his offer of support before us. I regret that I was not immediately supportive of her when I learned what she had done. I stand beside her now, ashamed that I cannot make the same confession of the others.
"The most important lesson that I have received, however, was from Draco Malfoy. I have long indulged in self-pity regarding the prophecy concerning me and the responsibility it placed upon me. I wallowed in the pain of my loss and the sacrifice I was forced to make. Malfoy lived a life of solitude, in some ways much worse than my own, without complaint. He chose to remain in an abusive atmosphere on the hope that he could turn it to our advantage some day.
"He believes that the future and world at large is more important than the individual. He sacrificed himself, he sacrificed everything, for the chance to save our children. He willingly walked away from his innocence to preserve that of others. He willingly tore his own soul, taking the lives of a few already condemned, in the effort to save countless. He took the dark mark, knowing what it would mean at the end of the war, to achieve a place of benefit for the Order of the Phoenix. He influenced the death eaters, making our plan effective, saving our lives, playing an invaluable role in our victory, knowing that his contribution would probably go unrecognized. He allowed himself to be taken, peacefully, without resisting. He endured his imprisonment and trial without complaint. He did not speak out against his sentence. The only injustice that broke his heart and brought him to the point of fighting was the accusation of Ginny.
"He has shown me what it truly means to sacrifice oneself for one's convictions. He has taught me what it means to live a life of dedication. He has brought me to realize how selfish and shallow I have been.
"Ginny cannot be guilty of treason if her actions were in the best interest of us all. No, I say we are the ones guilty of treason. We are the ones who have betrayed those we claim to protect, to love, by ruling against Malfoy and ordering Ginny not to contact him."
He finished his speech and stepped down. He didn't wait for further questions. He didn't wait to be dismissed. He simply left. He couldn't bear to face the girl any longer.
She had watched him intensely the entire time he had spoken. She couldn't believe what he was saying at first. She was proud of him. She felt sorry for him. She was convinced his speech was pointless. Her deep, pained, and dull eyes made it difficult for him to breathe.
The ruling was unanimous. She was free to go. Upon further review of the case, Malfoy was released as well. Due to Harry's speech, Draco was considered second only Harry in his contribution to the war. The two were held up as examples of honour and strength for countless years to come, both revered for their virtue.
Draco thought that it was absolutely hilarious, mainly because the only other option was to become exceptionally bitter, that Harry's words had turned him into some sort of demi-god in the eyes of a public that had theretofore loathed him. Ginny was just glad he had been released and that her family finally understood.