The same phenomenon may have different reasons behind it, as there are variables, especially time and objects. Therefore, reasoning is essential. A proper reasoning saves the person oneself.
There are two general ways of reasoning, forward or backward. Forward is more confident, requiring rich experience, whereas backward is easier to apply.
“When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” A famous saying from Holmes, by Conan Doyle.
Reasoning established, only in logic. Proper reasoning will reduce the fear, an invisible, deep-seated emotion that poses a danger to humans. According to this perspective, logic helps humans remain calm.
In other words, reasoning helps to distinguish. All decisions that lead to action are based on a distinction from oneself, no matter if the outside influences it. Everyone is responsible for their own decisions.