Friends:

Careless Attention Enhances the Mental Hindrances!

The Blessed Buddha once said:
When one attends carelessly & irrationally any absent sense-desire arise, increase, grow and expand.
When one attends carelessly & irrationally any absent evil-will arise, increase, grow and expand.
When one attends carelessly & irrationally any absent lethargy & laziness arise, increase & expand.
When one attends carelessly & irrationally any absent restlessness & regret arise, increase & expand.
When one attends carelessly & irrationally any absent doubt & uncertainty arise, increase & expand.
Furthermore the Awareness link to awakening does not arise, and if present, then it instantly ceases.
Any absent investigation link to awakening does not arise, and if present, then it instantly ceases.
Any absent Energy link to awakening does not arise, and if present, then it instantly ceases.
Any absent Joy link to awakening does not arise, and if present, then it instantly ceases.
Any absent Tranquillity link to awakening does not arise, and if present, then it instantly ceases.
Any absent Concentration link to awakening does not arise, and if present, then it instantly ceases.
Any absent Equanimity link to awakening does not arise, and if present, then it instantly ceases.
However if one attends carefully and rationally the five mental hindrances do not arise and if already
arisen then they gradually cease. Secondly, any of the 7 mental links to awakening that has not yet
arisen arise and is gradually completed by mental development by repeated reflection & meditation...

Source (edited extract):
The Grouped Sayings of the Buddha. Samyutta Nikāya.
Book [V:84-5] section 46: The Links. 24: Careless Attention...