1. the faculty of discerning; discrimination; acuteness of judgment and understanding.
2. the act or an instance of discerning.
From my perspective it seems that at least one of the keys to discernment can be found in ones desire for truth. It seems the greater the desire one has to know what is true, the more one may discern the truth in any situation.For me, the bigger picture feels plays a large part in discernment. Connecting current pieces of the puzzle of information available to bits of learned experience from previous years creates sort of a overhead view of physical reality map.
Another key may be in resonance. When a person resonates with a particular concept or idea the information makes the most sense and seems to impart a feeling of strength.Remember only you can discern.