Read the following excerpt from James Baldwin's Giovanni's Room (1956):
" I remember that life in that room seemed to be occurring beneath the sea. Time flowed past indifferently above us; hours and days had no meaning. In the beginning, our life together held a joy and amazement which was newborn every day. Beneath the joy, of course, was anguish and beneath the amazement was fear; but they did not work themselves to the beginning until our high beginning was aloes on our tongues. By then anguish and fear had become the surface on which we slipped and slid, losing balance, dignity, and pride. Giovanni's face, which I had memorized so many mornings, noons, and nights, hardened before my eyes, began to give in secret places, began to crack."
In the sentence "Beneath the joy, of course, was anguish and beneath the amazement was fear", what is correct about the word "anguish" in this context?