There is a "different gospel" that many are preaching -- prosperity gospel, universalism, progressivism (relativism), and so forth. Jesus tells us to be wise and shrewd. Paul warns the church about those who will come and ravage the flock. We must safeguard our families, friends, the church, etc while at the same time interacting with different ideologies graciously and sensitively.
Scripture used: Matthew 7:15-23; Jude 1:1-8, 17-23