If something happens to you and you keep that incident in your mind and you ruin your sleep, your eating, everything, you are poisoning yourself by reacting. The buddhi, the intellect, shuts down. Buddhi is the finest portion of our mind that is clear crystal. It acts as a mirror onto which the individual self constantly reflects. If we used our intellect, we would not react, we would only act.
Life is full of circumstances, crisis, and problems for everybody.
The Gita is there to teach us and give you the opportunity to rise. You are a temple, where you visit every day. You light a candle light at the heart center. You pay your homage to that inner dweller. You sit there.