How do we know that externalism is a danger for Christians?

Externalism can be a significant danger for Christians as it may lead to a false sense of security. The parable of the ten virgins illustrates this danger well, where both wise and foolish virgins appeared similar outwardly. They bore the same name, wore the same attire, and even had lamps, but the critical difference was the absence of oil among the foolish virgins, symbolizing the Holy Spirit. This blindness to the necessity of true spiritual life can result in judgment upon the unprepared.

Additionally, externalism promotes a reliance on religious performances, traditions, or societal acceptance rather than a personal relationship with Christ. Many today may participate in church activities, adhere to moral standards, or engage in theological study while lacking a genuine connection with the Holy Spirit. As Bonar emphatically states, 'A religion without the Holy Spirit profits nothing.' Therefore, it's essential for believers to examine themselves sincerely, ensuring that their faith is grounded in spiritual reality rather than mere outward appearances.