What is showing thanks for parts of the body?

Sayyiduna Muhammad Bin Haani رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has narrated with reference to a friend that once someone asked Sayyiduna Abu Haazim رَحْمَةُ اللهِ تَعَالٰی عَلَيْه, ‘O Abu Haazim! How should I show thanks for the eyes?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه replied,        ‘If you see something good then publicise it and if you see something bad then conceal it.’ He responded, ‘How should I show thanks for the ears?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه replied, ‘If you hear something good then remember it and if you hear something bad then conceal it.’ He enquired, ‘How should I show thanks for the hands?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه replied, ‘Do not use them to obtain anything unlawful and do not restrict them from fulfilling your duties towards        Allah عَزَّوَجَلَّ.’ He enquired, ‘How should I show thanks for the abdomen?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه responded, ‘For it to have food in its lower portion and lots of knowledge in its upper portion.’ He enquired, ‘How should I show thanks for the private parts?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه replied, ‘As Allah عَزَّوَجَلَّ says in the Holy Quran:

وَ الَّذِیۡنَ  ہُمۡ  لِفُرُوۡجِہِمۡ  حٰفِظُوۡنَ  ۙ﴿۵﴾  اِلَّا عَلٰۤی اَزۡوَاجِہِمۡ  اَوۡ مَا مَلَکَتۡ  اَیۡمَانُہُمۡ  فَاِنَّہُمۡ غَیۡرُ    مَلُوۡ مِیۡنَ   ۚ﴿۶﴾   فَمَنِ   ابۡتَغٰی   وَرَآءَ   ذٰلِکَ   فَاُولٰٓئِکَ   ہُمُ   الۡعٰدُوۡنَ    ۚ﴿۷﴾

Translation from Kanz-ul-Iman: And who guard their private organs. Except from their wives or the legal bondwomen that they possess, for then there is no blame upon them. So whoever desires more than these two - they are crossing the limits. (Part 18, Surah Al-Mu`minoon, verse 5-8)

Then he asked, ‘How should I show thanks for the feet?’ He رَحْمَةُ اللهِ تَعَالٰی عَلَيْه replied, ‘If you see a living person that you are envious of, then use your feet to act like him (i.e. perform good deeds) and if you see a dead person that you resent, then refrain from acting like him (i.e. do not step forward towards evils). If you do this, you will become one who thanks Allah عَزَّوَجَلَّ. Whoever gives verbal thanks only and not with other parts of his body, he is like that person who has a piece of cloth and takes hold of a corner of it, but does not wear it, this cloth will not protect him from the heat, cold, snow and rain.’

(Hilyat-ul-Awliya, vol. 3, pp. 279, Hadees 3963)