How do we know that Jesus' promises are trustworthy?

The trustworthiness of Jesus' promises is rooted in His authority and character as the Son of God. In John 17:6, He prays, affirming that He has given the words of God to those whom the Father has given Him, establishing the divine source of His teachings. The certainty of His words is further exemplified by passages like Romans 8:28-30, which outlines God's purposeful plan for those He has called. Hence, believers can rest assured that all God has promised will surely come to pass, as His nature ensures that no promise can fail.