In this world there appears to be many things which arouse fear in you. The Course will express the idea that “nothing real can be threatened”. While that may seem reasonable to you as a concept, how does that effect you as an experience of being in this world? When you are afraid, things aren’t always so black and white. The panic and anxiety tend to make you unreasonable, that is why training your mind is so important. Here’s Jesus talking about the action of looking at your fear but also the need to understand that it is nothing but a mask to hide the deep cause.
"Fear is a symptom of your deep sense of loss. If, when you perceive it in others, you learn to SUPPLY the loss, the basic CAUSE of fear is removed…"
If there is no loss in you, there can be no loss in anyone, that is why He expresses it as “when you perceive it in others” because they are nothing but a reflection of your mind.
"…Thereby you teach yourself that fear does not exist in You, for you have in yourself, the means for removing it, and have demonstrated this by giving it. Fear and love are the only emotions of which you are capable. One is false, for it was made out of denial, and denial Depends on the real belief in what is denied for its own existence."
"By interpreting fear correctly, as a positive affirmation of the underlying belief it masks, you are undermining its perceived usefulness by rendering it useless. Defences which do not work AT ALL are AUTOMATICALLY discarded. If you raise what fear conceals to CLEAR-CUT, UNEQUIVOCAL PRE-DOMINANCE, fear becomes meaningless. You have denied its power to conceal love, which was its only purpose. The mask which YOU have drawn across the face of Love has disappeared."
"If you would look upon Love, which IS the world’s reality, how could you do better than to recognize, in every defence AGAINST it, the underlying appeal FOR it? And how could you better learn of its reality, than by answering the appeal for it by GIVING it? The Holy Spirit's interpretation of fear DOES dispel it, for the AWARENESS of truth cannot BE denied. Thus does the Holy Spirit replace fear with love, and translate error into truth. And thus will YOU learn of Him how to replace your dream of separation with the fact of unity. For the separation is only the DENIAL of union, and, correctly interpreted, attests to your eternal knowledge that union is true." ACIM ~ The Mechanism of Miracles
There is only love. When you come across anything else, it must be fear, which is simply a lack of love but as you supply the lack, the fear will disappear because there is no such thing as fear.