The chapter begins with the affirmation of the Divine origin of the Qur’an revealed to the Prophet although most people did not believe in it. It also draws attention to the wonders of creation, all of which are dependent upon Allah including lightning and thunder from which the chapter takes its name.
Divinity’s response to the ludicrous requests of those who cover up the truth are addressed and an assertion that Allah does not change the condition of a people until they change themselves.
Futility of asking other than Allah is followed by a parable of water from the sky which churns up impurities that are discarded just like those discarded when metal ore is heated to illustrate the difference between truth and falsehood.
No amount of ransom will be accepted at the Day of Judgement from those who break Allah’s covenant of submitting to Him and cause corruption on the earth.
An assertion that it is only the remembrance of Allah that brings tranquillity to the hearts follows. Finally the consequences for those who doubt accountability and deny Divine guidance is compared to the reward of those who are righteous and Allah being the best of planners and sufficient as a witness of the Divine source of revelation.