Shaqeeq Al-Balkhiy (rahimahullaah) said:
Corruption has entered the people in six affairs:
Weakness in their intention with regards to deeds performed for the afterlife.
Their bodies have become dependent on their desires.
They have been overwhelmed by prolonged hopes whilst their lifespans come close to an end.
They follow their desires and fling the Sunnah of their Messenger (sallal-laahu-alayhi-wasallam) behind their backs.
They give precedence to pleasing the creation in what they desire over what pleases the Creator in what they hate.
They have adopted the (unintentional) mistakes of the pious predecessors as religion and virtue for themselves.
[Source: Seerah As-Salaf As-Saaliheen (1/1126). Maktabah Shaamilah]