Why is being called a 'brethren' in Christ important?

The term 'brethren' indicates that all true believers share a common identity as children of God, affirming our relationship to one another in Christ. As described in the sermon, we are all part of one family, having been redeemed by the same Savior, and are called to love and support one another. This familial bond is grounded in the blood of Christ, uniting us as members with one Father, God Almighty. Such fellowship enriches the church's life, fostering a spirit of encouragement, mutual support, and holiness as we collectively strive for God's glory.