Hi Ian,
If "all things" are His creation that includes all the laws by which it is sustained; the laws of Physics, the laws of Mathematics, the laws of Nature, the laws of logic...
Jere 33:25 "Thus says the LORD: 'If My covenant [is] not with day and night, [and if] I have not appointed the ordinances of heaven and earth,
Everything in the universe is bound by ordinances/laws which it must obey. The universe is not arbitrary, the laws exist from which it operates only because God wills them to. We are just a part of His creation and of course we do not understand how all these logical and orderly laws work together that keeps this universe going, but they do.
The contradictions that we see are from man made reasoning. There is no contradictions in a perfect God and the law of logic (noncontradiction) reflects His perfect nature. We can see how these laws all work together in the natural world around us and point us to it's Creator.
Rom 1:20 For since the creation of the world His invisible [attributes] are clearly seen, being understood by the things that are made, [even] His eternal power and Godhead,
I don't know if this is answering your question, but it's how I understand it.
mercy, peace and love
Kat