My teacher told me about Surah 'Asr. He said that when this kind of understanding descends upon you you feel an extraordinary joy and elation. Allah (SWT) said : By the Time. My teacher said that when Allah (SWT) is swearing by time He (SWT) is going to say some thing that is time independent - something that will not change with time. This kind of things are very dear to scientifically oriented people, as my teacher is. Even generally we do have a sort of longing for certainty. And who else can give any certainty except Allah (SWT)? This Surah tells us about one such certain thing. When we are crushed by the failures and uncertainties of this world the amount of consolation that resides in this Surah is a big base on to which we can anchor.