How do we know our prayers are heard by God?

According to 1 Peter 3:12, the Lord's ears are attentive to the prayers of the righteous, and this righteousness is rooted in our union with Christ. Since the only truly righteous person is Jesus, our prayers are accepted through Him. In John 14:13-14, Jesus assures us that whatever we ask in His name, He will do, which affirms not only the power of His name but the access we have to the Father through Him. Thus, our assurance stems from our relationship with Christ and the acknowledgment that genuine prayer arises from faith and dependence on His grace.