A senior spiritual aspirant wrote,

I was pondering how the leisure of heart (faraghet e qalbi)  can be obtained.  This thought came to me that whatever discussion or action is not essential to avoid looking into it, listening and thinking about it. This is irrespective of it being from the past or related to the future.

Hakim al-Umma Shaykh Ashraf ‘Ali Thanawi (may Allah have mercy on him) replied,

‘May Allah give barakah in your comprehension abilities (faham). This is it.’

Tarbiyet us Salik, volume 1, page 739