He came from an era when Germany and Russia, especially in their intelligence arms of government were very much steeped in metaphysical practices and gnosis.
It is well known in these circles that intention and emotion must align to get coherent results. These can further be broken down into polar aspects of the mind, the subconscious, conscious and the overall circuit (the mother or god or superconsious).
With those tidbits, reread the sweet 16 again. ;-)
Think in terms of polarity (masculine, feminine), purity, coherency, and the power that alignments in this regard can bring. Remember that a "house divided against itself...."
Left brain influences right brain. So when he says that another boy could influence your girl what is he really saying. Interesting how this all ties in with my messages of the importance of identifying outer influences and regaining clarity.
Coherency - power Intention aligned with pure feeling is a powerful force of creation.
Reading some Neville for further synthesis would be helpful but be careful. Once you enter this rabbit hole the world will change and you can never go back. ;-)
Much is this is the same metaphysical knowledge that has been kept from the world by the very institutions that leverage their control upon it.
Read with new eyes.
Notice this illustration which is a dead giveaway..
Actually all the illustrations are speaking top your "feminine side".