"Love is Not All" is a poem written by Edna St. Vincent Millay. It was first published in 1931 and is also often referred to as "Sonnet XXX." In this poem, the speaker elaborates on the fact that love is often overrated in society, as people strive for love and would give anything in order to experience it, including their lives, which we can see in the following line:
Yet many a man is making friends with death
Even as I speak, for lack of love alone.
This is why the speaker in the poem gives us examples that show that such a desire to experience love is futile and unnecessarily overdramatic. For example, the speaker tells us that we don't really need love in order to survive, as it does not provide us with the important nutrients that our bodies need in order to stay healthy: "is it not meat nor drink." This line shows us that humans would be able to survive without love, yet they can't survive without food, represented by meat, or drink.
Another example the speaker gives us is that love is not "slumber"; we all know how important sleep is for human health and survival. A person deprived of sleep would not be able to survive for very long; however, the same does not apply for a person who is deprived of love.
Another quote from the poem that you might like to refer to in your answer is that love is not "a roof against the rain." In other words, while love may well be a nice and comforting feeling, it is not actually protecting us from anything or keeping us safe. Love does not provide proper shelter, which is something humans need in order to stay safe.