Martyrdom to Potions

Vizet's eyes did not leave the notebook. "Brewing a Laughing Potion in the most joyful mood..."

"Brewing Doxycide with hatred for doxies... setting a Sleeping Draught with a peaceful mood..."

"Creating a suitable environment... the potioneer is the one in control... knowing that these are the ingredients for Doxycide..."

He took a deep breath. "Why does that sound... a bit like Neville using the Confundus Charm to let himself bring out the advantage of 'focus,' successfully making the Confusion Draught thicken?"

That had happened during the Potions Class Exam. When Neville was brewing a Confusion Draught for the practical exam, he had used Boiled Castor Oil;

Under normal circumstances, the Confusion Draught would have struggled to thicken, just like what Harry had encountered. Yet with the help of the Confundus Charm, Neville had made the Confusion Draught thicken.

When Zygmunt Budge mentioned "brewing a Laughing Potion in the most joyful mood," it could actually be seen as making oneself believe that the Laughing Potion was a potion capable of bringing joy;

The effect of Neville casting the Confundus Charm and heightening his "focus" was making himself believe that as long as he continued brewing, he would be able to make the Confusion Draught even thicker...

"Wonderful... This should be the theory Zygmunt Budge truly wanted to talk about..." Vizet murmured. "Using the power a Wizard draws from the soul to make a potion achieve the effect he wants..."

"This is why Headmaster Dumbledore, Professor Snape... and even Voldemort all wanted to study the soul... the power of the soul... A Wizard himself is the most wondrous magic!"

If one were to summarize Zygmunt Budge's potion theory, it would be that by using the Wizard's own power, one could complete any potion;

But actually putting it into practice was not so