I think there’s a sense in which one’s systematic theology must be an organic outgrowth of one’s experience and understanding of their life on the one hand, and the Word of God on the other, specifically as that Word speaks into and about their life. You cannot simply cut and paste a whole system of doctrine that has been formulated by someone else, based upon their own interaction with the Word, into your own personal system of theology and philosophy. It just won’t stick unless it has grown up organically.
That is not to say that one cannot learn from another, or that learning systematic theology is a futile practice altogether. Rather, at this point, my sense is that a teacher (in whatever sense of the word) ought to use the elements of their own system of theology to nudge others in the right direction, suggesting paths to pursue and dangers to be avoided. Otherwise, in my experience, you end up with an empty set of propositions and assertions to which one either assents or dissents, but there is no real linkage to the person’s heart - what truly moves and drives them and what will make a real difference in their lives and in the lives of those around them.

Education is the process of making the familiar strange and the strange familiar.

In a discussion with a couple of pastors this morning on the topic of Christ-centered preaching/teaching it occurred to me that one can bring the accomplished and applied work of Jesus Christ to bear on any passage of scripture, but do so in a way that flatly and simplistically portrays Him. It is good to remember that, for whatever reason, God brought his people Israel down a very long road before fully unveiling the glorious salvation found in Christ. When the Messiah did come, everything that he did and said was pregnant with a profound significance that wove itself through every story of the Jewish scriptures. It is for this reason that we must continually dive back into the world of the Old Testament in order to properly understand and teach others about Christ. To sum up the identity and saving work of Jesus without reference to the story of His people as presented in the OT is to miss who He really is. In a sense, whether we are studying for ourselves or teaching others, we must continually retrace the lines of redemptive history in order to properly place any given element from God’s story.