None of his thinkings had been in Earth symbols.  Simple English he had freshly learned to speak, but much less easily than a Hindu uses it to trade with a Turk.  Smith used English as one might use a code book, with tedious and imperfect translation for each symbol.  Now his thoughts, pure Martian abstractions from half a million years of wildly alien culture, traveled so far from any human experience as to be utterly untranslatable.