Results of involvement in useless activities

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Shaykh Mawlana Karamat Ali Jaunpuri (Allah have mercy on him) said,

This lowly speaker has experienced it well that when an individual is engrossed in useless activities his/her previous piety wanes away. Therefore, one should repent immediately if he/she becomes involved in anything useless and not return to that activity again.

Irshad us Salikeen/Aqwal e Sufiya, page 36