## the message about the cross ##

''the preaching about the crucifixion" or "the message about Christ dying on the cross" (UDB)

## is foolishness ##

“is senseless" or "is silly."

## to those who are dying  ##

"dying" refers to the process of spiritual death.

## it is the power of God ##

"it is God working powerfully in us"

## frustrate the understanding of the intelligent  ##

AT: "confuse intelligent people" or "make the plans intelligent people make completely fail"