Courage and Fear
"Courage" the motivation to move on, the emotion that gives you strength to face pain and grief, "Courage" the emotion that seems to have limited quantities and seemingly depletes after use, the soul sustainer, the human sustainer, the emotion that gives those filled with dread the voice to speak.
"Fear" the paralysis that obstructs one from moving, hindering their every advancement, the abundant antithisis of "Courage", "Fear" the continual inhibitor and the perpetual obstructor of fortitude, the soul detainer, the human detainer,the emotion that silences those who wish to speak.
Without one there is no other, without fear there would be no courage, without courage there would be no fear, if one chooses to be courageous it is the fear that drove him to brink which inturn invokes courage, if one is induced by fear then it is the opposing courage that contrived him to succumb to the misery of being fearful. The "Fear" is invoked by the assertion of "Courage", as "Courage" is invoked through the suppresion of "fear", two halves of a coin but a whole coin none the less.