His Historiska Skrifter, which are a record of Swedish history, mainly autobiographical, during the greater part of the 18th century, is excellent as literature, but somewhat unreliable as an historical document, especially in the later parts.
Instinct told him that his old ally the khan of the Crimea was unreliable, and that the tsar of Muscovy was his natural protector, yet he could not make up his mind to abandon the one or turn to the other.
However brave the individual soldiers of such an army might be, the army itself was unreliable against a well-organized and disciplined enemy.
But when they pass beyond this narrow sphere, as particularly in the Gathas, the Pahlavi translator becomes a defective and unreliable interpreter.
Standardized testing is an unreliable way to measure students' intelligence and cognitive ablility.