What does the Bible say about the source of obedience?

In Hebrews 11:8, we see that Abraham obeyed when he was called by God to go to an unknown place. This indicates that true obedience stems from God's effective, irresistible grace. It's not based on human decision-making but rather God's sovereign call, as highlighted in Ephesians 2:8-9 where faith is shown to be a gift from God, not a choice of man. Without this divine call, there can be no genuine obedience or faith, reflecting the essence of salvation that emphasizes God's initiative in our response.