How do we know that fruits of righteousness are by Jesus Christ?

The fruits of righteousness come exclusively by Jesus Christ, as stated in Philippians 1:11. The Apostle Paul illustrates our total inability to produce these fruits without Him, akin to branches that cannot bear fruit apart from the vine (John 15:4). When we are united with Christ, it is God who works in us to will and to do of His good pleasure (Philippians 2:13). This underscores our complete dependence on Christ for spiritual life and effective service. Additionally, the transformative nature of these fruits acts as evidence of our sanctification and relationship with God, reassuring us that our faith and works are a result of His grace at work in us.