The Invalidation of Actions by Shaykh Saleem ibn Eid Al-Hilaali
The Muslim is in a trade whose profit is the highest paradise, by keeping a strict account of oneself firstly over the accounts of worldly profits.
So it is incumbent on everybody who has firm resolute, believes in Allah and the last day, that he should occupy himself with self accountability. He must restrict himself upon this in his movements, whilst stationary and in his thoughts, because every moment in a person’s life is like an expensive jewel.
This is because the soul inclines towards what may benefit it from wealth and status. It goes into excesses, thus invalidating it’s actions, because what sprouts in spring may kill or eat up nothing but the sweet greenery.
So it is important to know the characteristicsb which the soul finds pleasant, thus invalidating one’s actions by them and losing the reward while one does not know.