Salvation is only for the sake of the merits of Christ

"Yet we must not think, that the Gospel of Christ is a new
law, whereby, as the Fathers of old under the Old Testament,
were saved by an old law, so men, now under the New
Testament, are saved by a new law. For unless thou understand
the word law, generally for doctrine, as the prophets several
times are wont to use the word law; certainly the Gospel of
Christ, properly, is no law, as Paul is wont to use the word law,
but is good and joyful tidings concerning the Son of God, our
Lord Jesus Christ, who is the only Expiator of our sins and
appeaser of the wrath of God, our Redeemer and Saviour.
Neither are the precepts of the law, which are contained in the
Apostolic writings, a new law, but an explication of the old law,
according to the mind of the Holy Ghost, which are not darkly
contained before in the writings of the Prophets, but are
repeated in the ministry of the Gospel of Christ, that the severity
of God’s law, and the corruption of our nature, being plainly laid
open, we might be excited to enquire after and embrace Christ,
revealed in his Gospel; and that we should be acquainted by
what rule our life of faith in Christ should be directed.
Wherefore, if we ought to speak properly concerning the Law of
God and the Gospel of Christ, even as we are not to make Christ
a new lawgiver, seeing he has not made a new law, nor erected
a new politic kingdom on earth; so neither is the Gospel to be
turned into a new law, which offer eternal salvation to the
performers thereof. But we think, that it is most certain, that
there is one and the same natural and moral law, both of the
Old and New Testament; and eternal salvation is not to be had
by men under the Old or New Testament for the merits of the
works of the law, but only for the sake of the merits of our Lord
Jesus."

- Isaac Chauncy, in "Neonomianism Unmasked OR, A Plea for the ANCIENT GOSPEL"

The book is online at neonomianism-unmasked.pdf (supralapsarian.com)