What does it mean that salvation is by God's will?

Salvation being by God's will signifies that it is not at the mercy of human decisions but fully originates from God's sovereign purpose. This is illustrated in Mark 1:41-42 where Jesus, moved with compassion, cleansed the leper. God’s will is active in the process of salvation, from election to sanctification and final perseverance, as emphasized in Ephesians 1:4-5, which states that believers are chosen in Christ according to His will. Thus, the assurance of salvation rests on God's faithfulness and not on our fluctuating wills or merits.