Titus 1:10, "For there are many rebellious people, full of meaningless talk and deception, especially those of the circumcision group.”

Interesting points:
1. In this verse, Paul underlines the need to identify and deputize elders of the right temperament, character, and Biblical wisdom/authority: they would help protect other believers from false teachers which existed on the island of Crete (and elsewhere).

2. Paul’s warning to Titus concerning “many rebellious people” communicates that the large number of false teachers posed a massive problem for Titus and other Christian leaders on Crete. Such teachers were "full of meaningless talk and deception", indicating their words were misleading interpretations of Scripture (if they even referred to Scripture) and/or the result of man’s foolishness, both which could lead others astray.

3. Paul specifically mentions "those of the circumcision group." These people were a movement within the early church who taught that Gentile Christians must be circumcised and obey the law of Moses to live as obedient followers of Christ although we understand from Acts 15 that the church at Jerusalem addressed this controversy approximately 14 years earlier (around 50 AD). Although was agreed then that circumcision and Torah-observance was not required of Gentile converts, such assertions circulated widely in the Church as certain proponents tried to impose their view on others.

Application.
Brothers, isn’t it amazing when certain Christians strongly adhere and try to impose traditions and their world view on others using the cloak of righteousness? Rather than studying the fulness of the Word and seeking God’s truth, they hold on emotion and a shallow understanding of the Scripture to impose an agenda.
Our best defense in such cases is to study the truth, weighing very carefully what Scripture has to say (or doesn’t say) about a given topic. There are times where we can extend grace and agree to disagree and times when meaningless talk and deception must be exposed for what it is.
May God bless our study of His Word so that He gives us discernment and the wisdom to know the difference and to handle the Truth accurately, kindly and firmly.