It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) never performed the Duha prayer. Sometimes, the Prophet (peace and blessings be upon him) would abandon a deed despite loving it, only because he feared that people might start acting upon it and as a result, it would become obligatory upon them (and then they might not be able to do it). Therefore, the Prophet (peace and blessings be upon him) preferred that there should be more ease in the obligations upon the people.