There is no more contemptible type of human character that that of the nerveless sentimentalist and dreamer, who spends his life in a weltering sea of sensibility and emotion, but who never does a manly concrete deed.

William James (1842-1910) American psychologist and philosopher

The Principles of Psychology, Vol. 1, ch. 4 “Habit” (1890)
    (Source)

This chapter originally published in Popular Science Monthly (Feb 1887).