'the broad path of honesty'

They spent two evenings getting an exact definition. The slicker was good-looking or clean-looking; he had brains, social brains that is, and he used all means on the broad path of honesty to get ahead, be popular, admired and never in trouble. He dressed well, was particularly neat in appearance and derived his name from the fact that his hair was inevitably worn short, soaked in water or tonic, parted in the middle and slicked back as the current fashion dictated.

—F. Scott Fitzgerald, This Side of Paradise (1920)