Amen! Once I really understood imputation it gave me great comfort because I was aware God demands perfect righteousness to be saved.
Below is a link to Whitefield’s sermon “The Lord Our Righteusness”
http://www.biblebb.com/files/whitefield/GW014.htm
We have that perfect righteousness, that is ? In another, Jesus Christ, his perfection, and we also have been made perfect in him.
We are the righteousness of God in Christ Jesus.