Everything in this world is little, because it is made out of littleness. Littleness is the opposite of magnitude. You, who are created by God in His likeness, are magnificent in that you are infinite and unlimited and everywhere. To contrast that against being VERY SMALL, being little is the antithesis to Heaven.
This entire world therefore was made FROM the idea of being very small, little, confined, limited and isolated. This is why the "building blocks" of matter, particles and such, as so extremely tiny. They are the idea of the total extreme of being as little as possible, in OPPOSITION to the nature of Heaven, where everything is infinite. You made a world on the FOUNDATION of the idea of being as small as possible!
Human bodies, as large as they seem to be, are still extremely little, in contrast to the universe and to spirit. You might think therefore you are just this "little" person on a huge planet. This could not be further from the truth and is TOTALLY backwards, in defiance of God's will. You are gloriously magnificently massive, and this "bleak little world" is absolutely TINY in comparison to what you are. This is why "the body cannot contain you who are love." To remain in a little tiny body, confined to it, when you could spread your wings and envelop all of Creation, is a condemnation of what you are.
"T-15.III.1. Be not content with littleness. 2 But be sure you understand what littleness is, and why you could never be content with it. 3 Littleness is the offering you give yourself. 4 You offer this in place of magnitude, and you accept it. 5 Everything in this world is little because it is a world made out of littleness, in the strange belief that littleness can content you. 6 When you strive for anything in this world in the belief that it will bring you peace, you are belittling yourself and blinding yourself to glory. 7 Littleness and glory are the choices open to your striving and your vigilance. 8 You will always choose one at the expense of the other."
Also, in this world, things which are truly small are blown way out of proportion, and things which are large are made to look tiny. This world is a REVERSAL of the laws of God and the nature of Heaven. You who seem tiny, are really huge. What seems huge - this world, is really nothing.