When the Pharisees inquire of Jesus about the indissolubility of marriage, they try to trick Jesus. Likewise, there are people that seek to trick Christians today.
Evil often manifests itself as something attractive: even as something good. By relying on God through prayer, a disciple of Jesus can avoid temptation and tricks.
Dear God, I know that I live in a dangerous world. When I am tempted today, grant me the courage to stick to the truth.