Definition and Overview:
Complacency, in a biblical context, refers to a self-satisfied state of mind that can lead to spiritual stagnation and a lack of vigilance in one's faith journey. It is characterized by a sense of contentment with one's current spiritual state, often resulting in neglect of spiritual growth and a diminished sense of urgency in pursuing God's will.

Biblical Warnings Against Complacency:
The Bible provides numerous warnings against complacency, urging believers to remain vigilant and proactive in their faith. In the book of Proverbs, complacency is directly addressed: "For the waywardness of the simple will slay them, and the complacency of fools will destroy them" (Proverbs 1:32). This verse highlights the destructive nature of complacency, equating it with foolishness and spiritual peril.

In the New Testament, Jesus warns against spiritual complacency in the parable of the ten virgins (Matthew 25:1-13). The five foolish virgins, who failed to prepare adequately for the bridegroom's arrival, serve as a cautionary tale about the dangers of being unprepared and complacent in one's spiritual life.

The Call to Vigilance and Diligence:
Scripture consistently calls believers to be vigilant and diligent in their walk with God. The Apostle Paul exhorts the Corinthians, "Be on the alert. Stand firm in the faith. Be men of courage. Be strong" (1 Corinthians 16:13). This call to alertness underscores the need for constant awareness and readiness in the face of spiritual challenges.

Similarly, Peter warns believers to be sober-minded and watchful: "Be sober-minded and alert. Your adversary the devil prowls around like a roaring lion, seeking someone to devour" (1 Peter 5:8). This imagery of a prowling lion emphasizes the ever-present threat of spiritual complacency and the need for continuous vigilance.

Practical Steps to Guard Against Complacency:
1. Regular Self-Examination: Believers are encouraged to examine themselves regularly to ensure they are in the faith and growing spiritually. Paul advises, "Examine yourselves to see whether you are in the faith; test yourselves" (2 Corinthians 13:5). This practice helps identify areas of spiritual stagnation and prompts necessary changes.

2. Persistent Prayer and Study of Scripture: Maintaining a robust prayer life and consistent study of God's Word are essential in combating complacency. The psalmist declares, "Your word is a lamp to my feet and a light to my path" (Psalm 119:105), highlighting the guiding and illuminating power of Scripture in a believer's life.

3. Active Participation in the Faith Community: Engaging with fellow believers through worship, fellowship, and service can help prevent complacency. The writer of Hebrews encourages believers not to forsake assembling together, but to encourage one another (Hebrews 10:24-25).

4. Setting Spiritual Goals: Establishing clear spiritual goals and regularly assessing progress can foster growth and prevent stagnation. Paul speaks of pressing on toward the goal for the prize of the heavenly calling (Philippians 3:14), illustrating the importance of having a forward-looking mindset.

Examples of Complacency in Scripture:
The church in Laodicea serves as a stark example of complacency in the book of Revelation. Jesus rebukes them for being lukewarm, neither hot nor cold, and warns them of the consequences of their complacency (Revelation 3:15-17). This admonition serves as a powerful reminder of the need for fervency and commitment in one's spiritual life.

Conclusion:
While the Bible does not explicitly use the term "complacency" frequently, the concept is woven throughout Scripture, urging believers to remain vigilant, diligent, and proactive in their faith. By heeding these biblical warnings and embracing practical steps to guard against complacency, Christians can ensure a vibrant and growing relationship with God.