Darkness is absence of light and similarly negative thoughts are absence of positive thoughts. The answer to negative thoughts is to bring positive thoughts back. An idle mind is the devil’s workshop and will always think negative. Here are few ways by which you can remove negative thoughts.
• Think differently as taught by Adi Shankaracharya. Once Menaka approached Arjuna with lust and said that she wanted to have a son like him with him. Arjuna said that why wait for 25 years consider me as you son from today.
• Think opposite as taught by Patanjali. For example if you are thinking of stealing, then silently start thinking of charity.
• Think positive as taught by Buddha. Make a list of positive actions to be done today as the first thing in the morning and concentrate on that list. Divert your mind to the pending works. This is a type of behavioral therapy.