If you are writing a paper for school, or a book or some other project, you must put the concept or idea into your own words for it not to be considered plagiarism.
If you are simply "abosorbing" facts or concepts - which I presume means you are reading and remembering such facts - then there is no question of plagiarism involved because you are not duplicating or reporting the information.
Perhaps if you provide more details we can better answer your question. Are you writing a research paper for school or giving a speech? In what context will you be using the learned concepts and structures?
Student or Learner