Definition of Atonement

I’ve been reading William Symington: Penman of the Scottish Covenanters. It has been a blessing so far and I may post some more excerpts in the future; however, for now here’s Symington’s concise definition of the atonement:

“That perfect satisfaction given to the law and justice of God, by the sufferings and death of Jesus Christ, on behalf of elect sinners of mankind, on account of which they are delivered from condemnation.”

This quote, although reproduced in the aforementioned book was originally found in Symington, William. The Atonement and Intercession of Jesus Christ (p.12)