The chapter is the last of the Musabbihaat (those that begin with a reference to the declaring of perfection of Allah). It identifies those who cover up the truth as being deniers of Divine guidance (Messengers) and Accountability calling the day of judgement as the day of ultimate success or ultimate failure.
Maintaining faith through afflictions is rewarded with Divine guidance to the heart. The chapter ends with the warning that wealth and children can be a source of diversion and thus of trial and with a reminder to spend in His way before being overcome by death.