A human being is often emotional. Our decisions, many times, are influenced by emotions. And, decisions driven by the emotions go wrong.
One has to think with cool mind that, an act being performed - a decision being taken, is not under the pressures of emotions. One has to introspect.
This is very well described in Bhagwad Geeta, Ch-3 verse42 (http://www.bhagavad-gita.org/Gita/verse-03-42.html).
The human has five senses which, he thinks, are superior. He always follows the directions (influences) of the senses. Moreover, his thoughts are dominated by the temptations of the senses. Once under such influences, he does not think about after-effects of his deeds. And thus his emotional decisions, when proved to be hasty and incorrect, bring to him a lot of restlessness and sufferings.
One's personality should be like a chariot.
The horses of the chariot run anywhere they like, when released free. But they do not, because they are tied with the strings to control. The strings are in the hands of the chariot-driver. He controls the horses and makes them run on the path. BUT who decides where to go? That's the Master of the chariot standing behind who orders to the driver where to go.
The horses are like our senses. The senses run after any (and all) temptations when made free. But they must be controlled by the mind because the mind is superior to the senses. The strings depict the mind, the thoughts. However, the mind must be comanded by the Intellect. The intellect has to empower the mind and let not brim over. The chariot driver is the intellect in one's personality. But there is something more superior to one's intellect, and that is his own consciousness. The intellect also may sway away from the track at times. It is the consciousness that must bring the intellect in position. The scolars think that the consciousness has the presence of the God in it. Everyone has the "He" in him. One has to realise He in oneself.
Whenever any decision is taken it should be confirmed by the intellect. Perform deeds that are "liked" by the God in oneself.