With his wide linguistic knowledge Eichhorn perceived that the language alone (though he also adduces other considerations) betrays the late origin of Ecclesiastes, which he places in the Persian Period (538-332 B.C.): Canticles, too, preserves linguistic features which are not of the Solomonic age.
The supposition of a Solomonic authorship for Proverbs is excluded by the whole colouring of the book, in which monotheism and monogamy are assumed, without discussion, to be generally accepted, while in Solomon's time and by Solomon's self the worship of many gods and the taking of more than one wife were freely practised, without rebuke from priest or prophet.
The objections to the Solomonic age as the time of origination of the book apply also to the period extending from Solomon through the 6th century.
The pseudo-Solomonic Book of Wisdom (generally supposed to be the work of an Alexandrian flourishing somewhere between Aristobulus and Philo) deals both with the Wisdom and with the Logos.
The altar of the Solomonic temple is on similar lines, but much larger.