Abdul-Azeez Al-Qurashee (rahimahullaah) said:

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) and you are not eager for its attainment (i.e. the eagerness that leads to sin, transgression, greed etc), and Allaah will make you see the concealed affairs of the worldly life (i.e. its corruption, true reality, worries etc when we are attached to it in a blameworthy manner).

It is incumbent upon you to have Wara (i.e. to have that type of fear that will keep you away from those affairs you fear will affect the affairs of your 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 to you; leave those affairs that resemble the truth but are falsehood in reality and your religion will be safeguarded. 

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Hilyatul Awliyaa 7/20