How good qualities become bad

When the qualities of good education, good parentage, beauty and sufficient wealth are misplaced in a person who is puffed up by all these possessions, they produce a very bad result. Milk is a very nice food, but when milk is touched by an envious serpent it becomes poisonous. Similarly, material assets such as education, wealth, beauty and good parentage are undoubtedly nice, but when they decorate persons of a malicious nature, then they act adversely. Another example, given by Canakya Pandita, is that a serpent that has a jewel on its head is still fearful because it is a serpent. A serpent, by nature, is envious of other living entities, even though they be faultless. When a serpent bites another creature, it is not necessarily because the other creature is at fault; it is the habit of the serpent to bite innocent creatures.

Srimad Bhagavatam 4.3.17 purport