Friends:

Careful Attention Weakens all the Mental Hindrances:

The Blessed Buddha once said:
When one attends carefully unarisen Sense-Desire does neither arise, nor later expand.
When one attends carefully unarisen Ill-Will does neither arise, nor later expand.
When one attends carefully unarisen Lethargy and Laziness does neither arise, nor expand.
When one attends carefully unarisen Restlessness and Regret does neither arise, nor expand.
When one attends carefully unarisen Doubt and Uncertainty does neither arise, nor expand.
Furthermore the Awareness Link to Awakening arises, and is gradually completed by repetition.
Any unarisen Investigation Link to Awakening arises, and is completed by gradual evolution.
Any unarisen Energy Link to Awakening arises, and is completed by repeated mental refinement.
Any unarisen Joy Link to Awakening arises, and is completed by meditative mental improvement.
Any unarisen Tranquillity Link to Awakening arises, and is completed by gradual mental silencing.
Any unarisen Concentration Link to Awakening  arises, and is completed by mental sophistication.
Any unarisen Equanimity Link to Awakening arises, and is completed by steady mental maturation.



More on the 5 Mental Hindrances and 7 Links to Awakening:
http://What-Buddha-Said.net/drops/II/The_5_Mental_Hindrances.htm
http://What-Buddha-Said.net/drops/III/The_Seven_Links_to_Awakening.htm

Source (edited extract):
The Grouped Sayings of the Buddha. Samyutta Nikāya.
Book [V:93-4] section 46: The Links. 35: Careful Attention...

Careful Attention!