I am not crying because.

[SoMaLiSiZz]

A man reached 70 years of age and he faced a disease; he could not urinate. The doctors informed him that he was in need of an operation to cure this disease. He agreed to have the operation done as the problem was giving him much pain for days. When the operation was completed, his doctor gave him the bill which covered all the costs. The old man looked at the bill and started to cry. Upon seeing this the doctor told him that if the cost was too high then they could make some other arrangements. The old man said "I am not crying because of the money but I am crying because Allah let me urinate for 70 years and He never sent me a bill."

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...and if you try to count the blessings of Allah, never will you be able to count them... Surah Ibrahim

Allah states that the servants are never able to count His blessings, let alone thank Him duly for them. In Sahih Al-Bukhari it is recorded that the Messenger of Allah( Peace and blessings be upon him) used to supplicate;

« اللَّهُمَّ لَكَ الْحَمْدُ غَيْرَ مَكْفِيَ وَلَا مُوَدَّعٍ وَلَا مُسْتَغْنًى عَنْهُ رَبَّنَا»

O Allah ! All praise is due to You, without being able to sufficiently thank You, nor ever wish to be cutoff from You, nor ever feeling rich from relying on You; our Lord!

It was reported that Prophet Dawud peace be upon him, used to say in his supplication, "O Lord! How can I ever duly thank You, when my thanking You is also a favor from You to me''

Allah the Exalted answered him, "Now, you have thanked Me sufficiently, O Dawud,'' meaning, `when you admitted that you will never be able to duly thank Me.'
Tafsir Ibn Kathir