Frederick Douglass? Apocryphal?

Question for Quote Investigator: Whenever a person is being evaluated it is necessary to consider the adversities that have impeded their progress. One should measure the heights achieved, but one should also consider the original challenging depths experienced by an individual. The famous orator Frederick Douglass said something like this. Would you please help me to find a citation?
Reply from Quote Investigator: On May 30, 1882 Frederick Douglass delivered an address at Decoration Day in Rochester, New York. The “Rochester Daily Union and Advertiser” newspaper published a transcript of the speech which included the following remarks. Boldface added to excepts by QI:1
Unquestionably the condition of the freedmen is not what it ought to be, but the cause of their affliction is not to be found in their present freedom, but in their former slavery. It does not belong to the present, but to the past. They were emancipated under unfavorable conditions. They were literally turned loose, hungry and naked, to the open sky . . .
Those who now carp at their destitution, and speak of them with contempt should judge them leniently, and measure their progress, not from the heights to which they may in time attain, but from the depths from which they have come.
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