Sentence:  While they are in this state striving perhaps to render their fellow beings more <WSD>happy</WSD>, of whatever sect or denomination they may be, they meet with one or more persons who undertake to convert their mere cold belief in religious doctrines—which is at best little better than mere morality—into real effective religion, a religion that will move the tongue. 
Meaning of the word marked with <WSD> tags:  Having a feeling arising from a consciousness of well-being or of enjoyment; enjoying good of any kind, such as comfort, peace, or tranquillity; blissful, contented, joyous.