I can exist both inside and outside you, I can be both your ally and your enemy. What am I?

Category: Brain · Difficulty: hard

Hint: Think about something that influences your thoughts and emotions.

Answer

Thought

Explanation

The mind can support or hinder personal growth, thus being both an ally and an enemy.

This is a hard brain riddle — a tricky one that takes a little thought. The answer is Thought.

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