Who said "It is a common mistake to underestimate one's enemies."?

This quote is attributed to Albus Dumbledore.

It is a common mistake to underestimate one's enemies. - Albus Dumbledore

"It is a common mistake to underestimate one's enemies."

Albus Dumbledore Wisdom

Character in Harry Potter and the Order of the Phoenix

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"It is our choices that show what we truly are, far more than our abilities."

"Ignorance is not bliss, it is just ignorance."

"Do not pity the dead, Harry. Pity the living, and above all those who live without love."

"Understanding is a three-edged sword: your side, my side, and the truth."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."