According to Tillich it is essential for man to ask questions. If man is in need or desire for something, he must ask. Obviously, he does not have the thing he is asking for or asking about. One must know abit about what he is asking for, or he would not be asking for it at all. We belong, yet are separated from our being.
Men are a combination of being and non-being.
If a living being thinks itself infinite, it never asks if it is finite or not, it is not as intellectual as man is to make the inquiring question at all. If we see something, according to Tillich, it is real, or a true being. To Tillich, faith in the true being or God, is essential. This can be traced back to the very beginning of the world. Still, humans want to know what the ultimate reality of the being consist of.