As a teacher, Peck was in the front rank. 'As an expositor of truth, as an exegete of Scripture,' his successor C.R. Vaughan believed, 'he was probably without a rival in his day.' But it was not mere teachers that he labored to prepare for the gospel ministry but rather men 'with a tongue set on fire'.
In this his own life was a constant example, possessed as he was with a moral conviction and a resolute fidelity to Scripture which 'sometimes puzzled the lovers of expediency'. Yet this was ever combined with a generous enthusiasm and warm affections. Devotion to principle is the only biblical remedy for our age of religious uncertainty and compromise. In these volumes, Peck's life work will be continued in another generation.