Psalm 91 is one of sixteen Psalms that are called Messianic Psalms; they are prophetic Psalms revealing the Messiah (Christ) to come. Psalms 2, 8, and 22 are three that you may know.
“For this is the will of God, that by doing good you may put to silence the ignorance of foolish men – as free, yet not using liberty as a cloak for vice, but as bondservants of God. Honor all people. Love the brotherhood. Fear God. Honor the king.” 1 Peter 2:15-17.
To define greed we will start with a leper; Naaman. The commander of the army of the king of Syria, Naaman is described by God Himself as a valiant man.
“Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; but exhort [encourage] one another daily, while it is called ‘Today,’ lest any of you be hardened through the deceitfulness of sin.” Hebrews 3:12-13.
The dictionary defines evil as, morally wrong; immoral; wicked. It could be something harmful or injurious; the synonyms though may be the best descriptions.
Depending on how it is used evil can be; sinful, iniquitous, depraved, base, vile, nefarious, pernicious, destructive, wickedness, unrighteousness, or corruption, to name a few.