Sins

Ibn al-Jawzi says:

وقوعُ الذّنبِ على القلب كوقوعُ الدّهن على الثوبْ إن لم تُعجّل غسله انبسطَ واتّسع !
‘𝗧𝗵𝗲 𝗲𝗳𝗳𝗲𝗰𝘁𝘀 𝗼𝗳 𝘀𝗶𝗻𝘀 𝗼𝗻 𝘁𝗵𝗲 𝗵𝗲𝗮𝗿𝘁 𝗮𝗿𝗲 𝗹𝗶𝗸𝗲 𝘁𝗵𝗲 𝗲𝗳𝗳𝗲𝗰𝘁𝘀 𝗼𝗳 𝘀𝗽𝗶𝗹𝗹𝗶𝗻𝗴 𝗹𝗶𝗾𝘂𝗶𝗱 𝗼𝗻 𝗮 𝗱𝗿𝗲𝘀𝘀. 𝗜𝗳 𝗶𝘁’𝘀 𝗻𝗼𝘁 𝗰𝗹𝗲𝗮𝗻𝗲𝗱 𝗮𝘀 𝘀𝗼𝗼𝗻 𝗮𝘀 𝗽𝗼𝘀𝘀𝗶𝗯𝗹𝗲, 𝘁𝗵𝗲 𝘀𝘁𝗮𝗶𝗻 𝘄𝗶𝗹𝗹 𝘀𝗽𝗿𝗲𝗮𝗱.’

[‘Al-Mudhish’, p. 357].

Sins tend to have a domino-effect … they will affect your other acts of worship. And if you tolerate it once, it will keep happening again. It becomes the new ‘normal’.