# commended

"praised" or "spoke well of" or "approved of"

# he had acted shrewdly

"he had acted cleverly" or "he had done a sensible thing"

# the sons of this world

"the people of this world" or "worldly people." This refers to those who, like the unrighteous manager, do not know or care about God.

# the sons of light

Here "light" represents everything godly. Alternate translation: "the people of God" or "godly people"