An abstract idea is a concept or thought that lacks a physical form and cannot be perceived through the five senses.

Abstract ideas cannot be touched, seen, or physically held. For example, you can see a hug, but you cannot see the “love” behind it.
They are concepts that exist in thought rather than in the physical world.

A concrete idea is a concept that can be experienced through the senses, like a specific object or event that is tangible and real.
It can be perceived through senses like sight, touch, taste, smell, or hearing.

It is connected to the physical world rather than existing purely in thought.

Want to be more abstract? Focus on the why. 

Why did he lie on so many occasions? Why did he drown himself in racist propaganda and call it β€œjust reading the news”? Thinking about why something is good or right can encourages abstractness.

Want to be more concrete? Focus on the how. 
How many photos did you take of your last significant other? How many dating apps did you use to find them? Thinking about how something is or will be done can encourage concreteness. It focuses on the feasibility and helps generate concrete descriptions.

Abstract ideas cannot be touched, seen, or physically held: words cannot be held, but phones with text messages can.

Sex is not abstract. Having sex without a condom is not abstract. Jerking off to your ex’s photos is not abstract. Being beaten is not abstract. Nor is death.

Lying is abstract. So is trust, respect, freedom, government and morality.