How do we know the doctrine of particular redemption is true?

Particular redemption, the belief that Christ's atonement was specifically for the elect, is supported by various biblical passages. For instance, in John 17, during Christ's high priestly prayer, He mentions those the Father has given Him. Similarly, Ephesians 5:25 states that Christ loved the church and gave Himself for it, indicating that the intended recipients of His sacrificial death were a distinct group—His elect. Moreover, passages like Romans 8 expound on the idea that those whom God foreknew, He also predestined and justified, suggesting a direct link between God's choosing and Christ's redemptive work.