Our subconscious mind distinguishes between completed and unfinished tasks. The unsettled make us restless, sometimes even depressed.
Positive thinking makes life easier, but the key to success is discipline. Fortunately, one can practice discipline by training one's willpower.
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The idea that a book can advise a woman how to capture a man is touchingly naive. Books advising men how to capture a woman are far less common, perhaps because few men are willing to admit to such a difficulty. For both sexes, I recommend a good novel, offering scenarios you might learn from, if only because they reflect a lot of doubt.