Source requested for the analysis in Oroonoko Summary and Analysis of Section Two--Life in Coramantien

The following quote is taken from the analysis of Oroonoko Summary and Analysis of Section Two--Life in Coramantien in this study guide:

"In this era, melancholy was characterized as a disease of the wealthy, the aristocracy, or simply those who could refrain from labor. Those unlucky enough to suffer from melancholia, as it was known, were viewed as highly sensitive and intelligent people, more highly evolved, as it were, than their lesser, more physically healthy and mentally simple brethren. Indeed, in this era, a man with tears in his eyes was throught of as highly refined and thus admirable".

May I please request for the primary source(s) / reference(s) for this claim (that is not cited from another study guide)?