Why did the metaphor broke up with simile?
Metaphor.
Thinking in abstract way is very essential to live a successful life.
It is important to think in abstract way to understand abstract thought.
To experience reality we need to change the pattern of thought. Please learn to unlearn.
If u think then you are thinking about the thought.Not about the reality.
U can't see it with eyes but it is watching through it.
It is important to go through upanishad to understand what it is meant by living eternal.
Mastering Abstract Thought for Enlightenment : Unveiling the Art of Metaphors, Paradoxes, and More
Vidya is not mere knowledge. It is something which helps you to travel from darkness to light.
Yantras are abstract philosophical ideas I would recommend you to do dus vidya sadhana with Yantras.
Practicing yantra paintings can take you to higher order of understanding and relams.