The central message of this sermon is that loving one another as Jesus has loved us is a fundamental and unique commandment that supersedes the traditional "love your neighbor as yourself" principle. This new commandment is not just about treating others with kindness, but about loving them in the same way that Christ loves us - sacrificially, unconditionally, and at great cost to ourselves. The sermon emphasizes that this love is not something we can muster up on our own, but rather it flows from the love that Jesus has shown us. The takeaway is that if we truly want to be followers of Christ, we must demonstrate this kind of love to others, which will inevitably attract them to Christ and lead them to experience His love for themselves. In essence, loving one another as Jesus loves us is not just a commandment, but a relational dynamic that reveals the character of God to those who are watching.