Too quick a sense of constant infelicity.

The phrase suggests a temperament or mental habit that is overly swift to register life as unhappy—an acute sensitivity that turns ordinary discomforts into a continuous feeling of misery. In Taylor’s moral and devotional idiom, such “quickness” would typically be treated as spiritually and psychologically dangerous: it can magnify troubles, erode gratitude, and make patience harder to practice. Read this way, the line is less a diagnosis of external misfortune than a critique of an inward disposition—an anxious, self-tormenting readiness to interpret experience through the lens of perpetual dissatisfaction.