Introduction

In Ramadan, you don't know which of the last 10 nights is Lea Tulkadur. And so Allah Subhanahu wa ta'ala tests you because you are taught to pursue every single one of those nights as if it could potentially be Lea Tulkadur. But then Allah Aziz al-Tesu with the day of Aaraha, and you know exactly when it is. So there's a definite time, and there's an indefinite time. Both of them have their own spiritual benefits in terms of your pursuit of Allah Subhanah wa ta'alan.