You forgot this one @nova 👆 "Pain fed his hate, and hate fed his strength. Once, as a Jedi, he had meditated to find peace. Now he meditated to sharpen the edges of his anger.
He stared at his reflection a long time. His injuries had deformed his body, left it a ruin, but they’d perfected his spirit, strengthening his connection to the Force. Suffering had birthed insight."
Also, some Anakin fanboys like @Ant will disregard a couple of these quotes saying that Vader views himself as a different person than Anakin, so the quotes stating that he grew in power wouldn't apply to Anakin. However, here are some quotes stating pre suit Vader>Anakin, meaning that Suit Vader>pre suit Vader>Anakin
"He could feel his power growing, indeed. He had the measure of his “Master” already; not long after Palpatine shared the secret of Darth Plagueis’s discovery, their relationship would undergo a sudden … transformation".
"You have done well, my new apprentice. Do you feel your power growing?"
"Yes, my Master."
"Lord Vader, your skills are unmatched by any Sith before you. Go forth, my boy. Go forth, and bring peace to our Empire."