As an adjective, sublime means a subject that is causing deep emotions and feelings of wonder or joy. The noun sublime describes a subject that is without equal, that is supreme or of great moral, artistic or spiritual value.
More simply, F. Schiller uses the notion of sublime as a tool available to anyone for overcoming all the inconvenient aspects of the experiences we must go through in life. Mere submission to power is not the main goal of Humanity, one should always show grace when obliging, and dignity when being the one who is obliged. However, for him, the sublime is mostly possible with a determined inclination towards the good and the beautiful. To sublimate also means to direct any energy available to something beneficial.