Discernment.

The KNOWing and DOing.

What do you know?

"And the LORD God said, Behold, the man is become as one of us, to KNOW good and evil:" (Gen 3:22).

One of the fascinating things about God is that, even thou He knows everything about good and evil, HE CANNOT AND WILL NOT DO EVIL. But this is not so with men that are not with God.

Why do we need discernment?

[verb - To perceive or recognize (something).
"I can discern no difference between the two policies"]

Today, it is almost impossible to discern(or know) what is good and evil without the knowledge of God through His Word. Man became void of the knowledge of God, and so will continually not do what is pleasing to God. (Remember then that Adam & Eve only had God to answer to, and still the same today and will be forever more.)

"Can two walk together, except they be agreed?" (Amos 3:3)

This is the very reason Adam and Eve were driven from the presence of God in the garden: "And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, LEST HE PUT FORTH HIS HAND, and take also of the tree of life, and eat, and live for ever:...So he drove out the man; and he placed at the east of the garden of Eden Cherubims, and a flaming sword which turned every way, TO KEEP THE WAY OF THE TREE OF LIFE." (Gen 3:22-24).

The way of Life of God cannot co-exist with that of evil. If you do evil, you can't have this life of God. You cannot touch life while still being evil. It's impossible. Prosperity wise, you cannot serve mammon and expect God to bless you.

Conclusion.

Come (back) to Christ and learn of Him all that pleases God, and see if you won't be granted access to the tree of life. 

"My son, keep my words, and lay up my commandments with thee. Keep my commandments, and live..." (Pro 7:1-2).

People might call you names for DOing your best in pleasing God, but should you because of this not want to please Him?!
To live without the knowledge of God (or discernment), is worthless and foolish. Glorify God always, for life is too short.