Supposing I saw a man tumble into a river, and I were to jump in and
rescue him, I should be a saviour to him--I should have saved him. But
when I brought the man ashore, I should probably leave him, and do
nothing further.
But the Lord does more. He not only saves us, but He redeems us--that
is, buys us back. He ransoms us from the power of sin, as if I should
promise to watch over that rescued man for ever, and see that he did
not again fall into the water. The Lord not only saves us from
spiritual death, but He redeems us for ever that death can never touch
us.