Unlike beings, Being is hard to concentrate on and it is easy to forget to think about it. But one particular entity has a more noticeable Being than others, and that is myself, because, unlike clouds and portals, I am the entity who wonders about its Being. It even turns out that I have a vague, preliminary, non-philosophical understanding of Being already otherwise I would not have thought of asking about it. This makes me the best starting point for ontological inquiry I am both the being whose Being is up for question and the being who sort of already knows the answer.
Sarah Bakewell, At The Existentialist Café: Freedom, Being, and Apricot Cocktails
This is from the chapter on Heidegger