Calling very serious christians – here is a quite academic series of talks from a very serious scholar. They are above my head but so what! I am indebted to and can confirm the advice of John Piper about reading above your level. Your level does lift over time. I can read stuff today that I couldn’t have imagined being able to engage with 5 and 10 years ago. Also while reading above your level – you do get some of the things and as you push ahead you begin to gets stuff your earlier had to gloss over.
So watching lectures is kinda’ the same deal and I encourage you to read, think and converse above your level. Big ideas under consideration are like muscles worked out in the gym. Under strain, there is growth. I certainly prefer books to running machines, though I need both.
They are all over 60 minutes so treat them like a study series and watch one a week and repeat it within the week of viewing to maximise opportunites for increased understanding.