"You know better the affairs of your worldly life." [Muslim]
The above hadith is one on which some people base their evasion of the legal injunctions in the spheres of economics, civic and political duties, and the like, because these matters - so they claim - are among worldly concerns, and we know them better, and the Messenger, peace be upon him, entrusted them to us! But is this really what the noble hadith intends?
By no means. Among the purposes with which God sent His messengers is that they should stipulate for the people the principles of justice, the balanced norms of equity, and the regulations of the rights and duties in their worldly life, so that their standards should not clash, nor their ways differ. [Quran, Al-Haidid, 57:25]
So texts of the Book and the Sunnah have come which order and regulate everyday concerns - selling and buying, partnership and mortgaging, leasing and lending, and other matters - to the extent that the longest verse in the Book of God was sent down on the arrangement of a matter that is slight among the worldly matters, namely the writing down of debts. [Quran, Al-Baqarah, 2:282]
This hadith is interpreted by the occasion that prompted it, namely the incident of the pollination of date-palms. The Prophet's indication to the people about this was his conjecture, for he was not an agriculturist, he had grown up in a valley not endowed with crops. But the Ansar supposed his opinion to be by way of a revealed or religious command, and so they abandoned pollination. Its effect was bad for their yield.
"Approaching the Sunnah: Comprehension & Controversy" - Yusuf Al-Qaradawi, pp. 126, 127