As I was reading the best sentence in the Al Quran, I also pondered in what context this sentence was revealed to Prophet Muhammad by Allah swt.
I went to read further up to verse 26 and 27 which are as follows:
Allah disdains not to use the similitude of things, lowest as well as highest. Those who believe know that it is truth from their Lord; but those who reject Faith say: "What means Allah by this similitude?" By it He causes many to stray, and many He leads into the right path; but He causes not to stray, except those who forsake (the path),-
Allah swt will not shy away from bringing any example- be it a learning from a mosquito or anything above it. Only the perverted transgressors (sinners) will question “What does God intend with this example?” Allah will lead them astray. It is because they forsake the path of truth.
Those who break Allah’s Covenant after it is ratified, and who sunder what Allah Has ordered to be joined, and do mischief on earth: These cause loss (only) to themselves.
Here Allah swt is referring to those who had believed but still doing sins. The root meaning of الْفَاسِقِينَ
Al faasiqeen is fasaq which means debauch/looseness/lustfulness/obscene. A person who is married and has a looseness of joining with other women considered as faasiqeen. In other words, those who had pledge to be believers and enters into sin thereafter are also considered as faasiqeen in the ‘eyes’ of Allah swt.
How can ye reject the faith in Allah.- seeing that ye were without life, and He gave you life; then will He cause you to die, and will again bring you to life; and again to Him will ye return.
How can you reject God when you were dead and He brought you to life? Then He makes you die, then He brings you to life, then to Him you return. And Allah swt cite an event way back before creation of Adam (alaihis salaam). That is verse 2:30 – The best sentence of the al Quran.
Allah swt defended you and me from the Angels and if He had listened to the Angels, He could have put our creation on hold. And we would not have experienced life and live in non-existence. By this citation Allah swt wants our gratitude towards Him. So give thanks to Allah swt and follow His guidance (Al Quran).
Truly man is, to his Lord, ungrateful 100: 6