"Your creations ARE the logical outcome of His premises. HIS thinking has established them FOR you. They are therefore THERE, EXACTLY where they belong. They belong to your mind, as part of your identification with HIS. But your state of mind and your recognition of WHAT IS IN YOUR MIND depends, at any given moment, on what you believe ABOUT your mind. Whatever these beliefs may be, they are the premises which will determine WHAT YOU ACCEPT INTO YOUR MINDS."
Jesus talking about the fact that you MUST have your own creations in heaven (and plural), because they are the logical consequence/outcome of GOD's premise. Since he is a creator, and creates in his likeness, YOU MUST be a creator who creates in your likeness and his. Thus you MUST have your own creations in heaven.
"His Sons and their children, who are like the Sons as they are like the Father."
"A co-creator with the Father (one or many of his sons) must have a Son*. 2 Yet must this Son have been created like Himself. 3 A perfect being, all-encompassing and all-encompassed, nothing to add and nothing taken from; not born of size nor place nor time, nor held to limits or uncertainties of any kind."
This is indisputable fact. You have children in reality.
Not only do you have children in Heaven, you also created them WITH YOUR BROTHERS.
"Accept your brother in this world, and accept NOTHING ELSE, for in him you will find your creations, because he created them WITH you. You will never know that you are co-creator with God, until you learn that your brother is a co-creator with YOU."
And because your brother is a CO-CREATOR with you and with God, your brother MUST be a permanent INDIVIDUAL BEING in heaven. You and your brother and God create multiple individual beings in heaven.
"In number infinite" - ACIM
"My self is ruler of the Universe: It is impossible that anything should come to me unbidden by myself. Even in this world, it is I who rule my destiny. What happens is what I desire. What does not occur is what I do not want to happen. This must I accept. For thus am I led past this world to my creations, children of my Will, in Heaven where my holy Self abides with them, and Him Who has created me."