Every wizard who embarked upon the path of magic had their own unique understanding of the soul and of magic.
From that perspective, there was some truth to Voldemort being called "the most powerful and dangerous Dark wizard in history."
To many wizards, there were simply too many aspects of Voldemort's magic that defied explanation.
For instance, just how profound was his mastery of Dark Magic? Why could he wield it so effortlessly, and cast the Killing Curse so frequently?
And what magic had he mastered that allowed him to fly freely through the air at high speed without the aid of any magical artifact?
Faced with a Voldemort shrouded in mystery, many wizards naturally grew fearful when they knew nothing about him.
When they had to face Voldemort, they instinctively sensed danger. Thus, it became only natural for them to consider Voldemort "the most powerful and dangerous Dark wizard in history."
After learning about Voldemort's path of magic, Wizet gained a deeper understanding of the word "dangerous" in that title.
Voldemort truly was an exceedingly dangerous wizard, and that danger stemmed from the magical path he upheld: "I alone reign supreme."
To him, the changes and rules of the world were not so important. What mattered most was what he thought and what he did.
It was precisely through such will and such beliefs that he had been able to travel so far down that magical path of "I alone reign supreme."
In a certain sense, Voldemort's attitude toward the world could perhaps be considered an extreme version of Zygmunt Budge's potion theory.
This belief that one's own will was paramount—even above the rules of the world—was what made Voldemort "the most dangerous."
Because a Dark wizard who believed that he was everything, and who truly possessed enough power