That wording is perfectly clear; indeed, its very text refutes your position. By “the Son” he meant himself—his human nature—and not a divine attribute. By “the Holy Spirit” he meant the power with which God supported him, or that same Holy Spirit breathed into his mother so that she conceived him; in neither case did he intend one of God’s attributes, exalted is He.
Yet you have interpreted his words in a way that runs counter to their obvious sense, an interpretation that clashes with plain reason and reliable transmitted evidence. How, then, can you claim to have adhered to the outward meaning of his speech?
Because the Christian doctrine of the Trinity is internally self-contradictory and devoid of any true reality, the very act of understanding it in full suffices to recognize its falsity—even though many additional proofs expose its error.
For this reason, a number of theologians have adopted the approach of saying that merely conceiving the Christian position is enough to know it is false, for it is inconceivable.
They explain: “The Christians contradict themselves in wording and lapse into impossibility in meaning. It is therefore impermissible to believe the doctrine they claim to profess, for it is self-contradictory. They maintain that the three are one and the one is three, yet such a belief cannot stand: no one can hold of a single thing that it is three while simultaneously holding that it is one, for those two claims negate each other. Inevitably, one must believe either that it is three or that it is one.
“No further proof is required to show the falsehood of anyone who asserts that the one is three and the three is one, because such a notion is simply beyond rational comprehension.”