Illusions
You build a world in your mind only through your intentions, your own thought processes. You go on building a castle: what the other person is thinking about you---they may not even think about you anything. You may simply not exist in other person's consciousness, for they are worried about themselves. But you build a big castle about what they are thinking about you in your mind.
Everything is Just a Thought
Wake up and realize this is all made up of thoughts, just thoughts, just thoughts. Your appreciation of beauty is a thought, your aversion to an object that is ugly is a thought. Your craving or aversion is nothing but a passing thought in the mind. Realize this is just a thought and you will be free.
Know Thought as Thought
Knowing a thought as thought brings the freedom. When you know a thought as a reality, that is when you are stuck.
Walls of Concepts
Your own concepts have created "walls" and so you need a "door." But when there are no concepts, there are no walls.
Now or Later
If you are upset, you don't say, "Ok, tomorrow, I'll get upset. Today let me not get upset." But anything good, anything that is uplifting the Self, we have a tendency to postpone: "I'll do it tomorrow, later on, another time."