All by Himself God has
- HE initiated our salvation: Rom 8:29
- HE accomplished our salvation thru Christ: John 10:11 & Gal 1:4
- HE applied our salvaiton: 3:11 & Titus 3:5 & 2 Tim 2:25
In theological terms this is often referred to as monergism (“mon” loosely means alone & “erg” loosely means works) which is the opposite of synergism (“syn” = with).
All by himself means that our salvation is all to his glory!