“If you want a certain thing, you must first be a certain person. Once you are that certain person, obtaining that certain thing will no longer be a concern of yours.”
We can assume here the quote is referring to enlightenment as a “certain thing”. In order to become enlightened we must first be a certain person. This refers to our transformation, ironically back to our natural state as awakened beings. We can discard the illusions before us one by one, returning to enlightened beings. Once we have done this, we are no longer concerned with attaining things, desiring things, or being attached to things.
The simple fact is we cannot achieve happiness being attached to things, having endless insatiable desires, and having obsession of attaining things. This is a very common cause of suffering.