Shaykh Yasir Qadhi delves deep into chapters 34,35,36 and 37 of the book - Kitaab At Tawheed.
Chapter 34 deals with how feeling secure against the Plan of Allah contradicts Tawhid. Here we come across numerous facets related to this topic such as - the severity of punishment promised for the one who thinks himself safe from the Plan of Allah and the severe punishment promised for the one who despairs of the Mercy of Allah.
Chapter 35 deal with how a part of Iman (Belief) in Allah is the forbearance with what Allah has decreed. We realise the intensity of punishment promised to those who slap the cheeks in anguish and tear the clothes and call to the ways of the Days of Ignorance, the sign that Allah wants good or bad for His slave, the sign of love of Allah for His worshiper.
Chapter 36 deals with forbiddance of show off. We gather info on the explanation of the verse in Sural Al-Kahf (18: 110) and the fear the Prophet ﷺ had of Riya', for his Companions and how he explained Riya' by expressing the state of a person performing prayer for Allah, but he improves his rendering of the Salat when he knows that others are looking at him.
Chapter 37 deals with how it is of Shirk to perform a (righteous) deed for worldly reasons. The topics discussed in this chapter are - man's desire for the worldly gains on the pretext of the acting for the Hereafter, the praise upon the Mujahid and much more.