The Hardening in the Sacred Scripture.
"He hath hardened their heart."-- John xii. 40. The Scripture teaches positively that the hardening and "darkening of their foolish heart" is a divine, intentional act. This is plainly evident from God's charge to Moses concerning the king of Egypt: "Thou shalt speak all that I command thee; and I will harden Pharaoh's heart, and multiply My signs and wonders in the land of Egypt. But Pharaoh shall not harken unto you, and I will lay My hand upon Egypt, and the Egyptians shall know that I am the …
Abraham Kuyper—The Work of the Holy Spirit

The Prophet Amos.
GENERAL PRELIMINARY REMARKS. It will not be necessary to extend our preliminary remarks on the prophet Amos, since on the main point--viz., the circumstances under which he appeared as a prophet--the introduction to the prophecies of Hosea may be regarded as having been written for those of Amos also. For, according to the inscription, they belong to the same period at which Hosea's prophetic ministry began, viz., the latter part of the reign of Jeroboam II., and after Uzziah had ascended the …
Ernst Wilhelm Hengstenberg—Christology of the Old Testament

Samuel
Alike from the literary and the historical point of view, the book[1] of Samuel stands midway between the book of Judges and the book of Kings. As we have already seen, the Deuteronomic book of Judges in all probability ran into Samuel and ended in ch. xii.; while the story of David, begun in Samuel, embraces the first two chapters of the first book of Kings. The book of Samuel is not very happily named, as much of it is devoted to Saul and the greater part to David; yet it is not altogether inappropriate, …
John Edgar McFadyen—Introduction to the Old Testament