Answer:
"full of sound and fury,/ Signifying nothing."
Step-by-step explanation:
This is the line that best expresses the idea of life being ultimately meaningless. In these lines, Macbeth tells us that life is full of sound and fury. This indicates how life feels complex and important when it is happening. Yet, he argues, it ultimately signifies nothing. He thinks that even though life appears to be full of experiences and events, in the end none of them actually mean anything.