If you "keep the whole law, and yet offend in one point, "you are guilty of all." 2:10

"He shall have judgment without mercy, that hath shewed no mercy." 2:13

James says Abraham was justified by works (for being willing to kill his son for God); Paul (Romans 4:2-3) says he was justified by faith (for believing that God would order him to do such an evil act). 2:21

"Ye ask, and receive not, because ye ask amiss."
If your prayers are not answered, it's your own damned fault. 4:3

Whoever is a friend of the world is an enemy of God. 4:4