His words, Exalted is He:

…and God bears witness that the hypocrites truly are liars.

He said:

[This was] because they affirmed with their tongues what their hearts did not acknowledge. This is why He named them hypocrites. Whoever knows [the truth] with his heart and affirms it with his tongue, yet without any excuse does not perform with his bodily members (bi-arkānihi) that which God has made compulsory for him, is like Iblīs, may God curse him, who knew it [the truth] and affirmed it, but did not act upon His commandments.

He further said:

Hypocrisy (nifāq) is of two kinds: [one is] a belief (ʿaqd) held in the heart which is contradicted outwardly on the tongue, just as He has said, Exalted is He: They say with their tongues what is not in their hearts [48:11]; the other is the hypocrisy of the natural self (nafs al-ṭabʿ) towards the person to whom it belongs, and this was referred to by the Prophet ﷺ when he said, ‘The hidden association [idolatry] (shirk)^{1That is, associating others with God, or ascribing partners to God.} in my community is more hidden than the crawling of an ant across a boulder on a dark night.’^{2Nīsābūrī, al-Mustadrak, vol. 2, p. 319; Tirmidhī, Nawādir al-uṣūl, vol. 4, p. 147; Mundhirī, al-Targhīb, vol. 4, p. 16.}

His words, Exalted is He:

O you who believe, do not let your wealth and your children distract you…

from performing your religious duties on time. For whoever is distracted from the remembrance of God or His service (khidma) by some phenomenon, or something for the sake of his lust (shayʾan li-shahwatihi),^{1That is, following MS F638, f. 55b, which has aw shayʾan, while the published edition has shayʾan. MSS Z515, f. 116b and F3488, f. 266b have aw sababan.} [if then] he experiences [thereby] exultation (nashāṭ) in his devotions, he is deluded (makhdūʿ),ʿsave in [those religious duties] which God, Mighty and Majestic is He, accepts.

It has been related that once [when he was ailing] Salmān was visited by Saʿd b. Abī Waqqāṣ. Salmān wept, so Saʿd asked him, ‘What could be making you weep, O Abū ʿAbd Allāh, when our Master the Messenger of God ﷺ was content with you when he died, and you will meet your companions again and will drink from his pool?’^{2According to several aḥadīth, the Pool (ḥawḍ) is one of the blessings promised by God to the Prophet for his nation. In the section on the Pool in the Kitāb Dhikr al-mawt of Ghazālī’s Iḥyāʾ ʿulūm al-dīn, he writes ‘It is our hope that God (Exalted is He!) will grant us to know of it in this world and to taste it in the next, for one of its qualities is that whoever drinks of it shall never thirst again.’ See trans. Winter, pp. 217–9, whence this extract was taken.} Salmān said, ‘I do not weep out of fear of death or because of an avid attachment to the world, but rather because the Messenger of God ﷺ enjoined on us a commitment and said: “Let the provision that one of you takes from this world be like the victuals a rider [traveller] (rākib) takes [for his journey].”^{3Ibn Māja, Sunan, vol. 2, p. 1374; Nīsābūrī, al-Mustadrak, vol. 4, p. 353.} I have all these cushions around me, but all the Prophet ﷺ had around him was his blanket, his washing vessel and a bowl for food.’ Saʿd said: ‘O Abū ʿAbd Allāh! Enjoin on us a pledge to which we can commit ourselves after you have gone.’ He said: ‘O Saʿd! Remember God, Exalted is He, when you have a concern that worries you, when you are making a judgement and when you are about to make an oath.’^{4Bayhaqī, Shuʿab al-īmān, vol. 7, pp. 305–6; Mundhirī, al-Targhīb, vol. 4, pp. 79, 112.}

But God, Exalted is He, knows best what is correct.