I would like to define the words in this scripture by using the original Greek so you will know there true meaning....
The first few words of this scripture mean; "Those who have found the perfect state of all things."
This is a level of consciousness where you see everything in the big picture....you see the unity...the harmony of all that is. You know what the scripture means when it says, "All things work together for the good of them that love God, to them who are called according to his purposes. Rom 8: 28
How are you able to do this? You exercise your senses. The word "exercise" means a regular work out as an athlete would do to stay fit or prepare for a competition. The word "senses" means the minds ability to perceive, understand and discern "what is." It is your awareness.
The word "trained" means to make it a habit or practice to see meaning, to understand or distinguish the difference...
The meaning of the word "good" is beautiful, excellent, useful.
The word "evil" means destructive or troublesome.
Therefore this means if you are spiritually mature...you will posses a higher levels of consciousness...you will know how to discern what is Light and what is Darkness...what is Healthy and what is Unhealthy. This is all done without passing judgement or condemning the darkness...instead you use wisdom and the love of God.
Steve Hart