I heard Sufyaan [rahimahullaah] saying:
It is incumbent upon you that you do not attach your heart to the worldly life [i.e. a blameworthy attachment as opposed to seeking one’s needs] and you are not eager for its attainment [i.e. the eagerness that leads to sin, transgression, covetousness etc], and Allaah will make you see the concealed affairs of the worldly life [i.e. its corruption and true reality when sought after in a blameworthy manner].
It is incumbent upon you to have الورع apprehensive fear – that type of fear that will keep you away from those affairs that are doubtful and thus may affect you in the afterlife – and Allaah will make your giving account on [the day of judgement] less burdensome.
Leave what makes you doubt for that which is not doubtful; leave those affairs that resemble the truth but are falsehood in reality and your religion will be safeguarded.
[Hilyatul Awliyaa 7/20]