True, but the light of truth needs to be brought upon ideas built upon sand.
Too many Christians are afraid to defend their beliefs, and foolish ideas are not challenged.
Sarcasm can be an effective tool to illustrate foolishness.
Chapter and verse?
1Pe 3:8 Finally, be ye all of one mind, having compassion one of another, love as brethren, be pitiful, be courteous:
1Pe 3:9 Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.