The phrase "utopian ideas" refers to thoughts or visions about a perfect or ideal society where everything is perfect, peaceful, and equitable. It often represents a hope for a flawless world that may be unachievable in reality. Full definition
«13 Utilizing this particular event as the criterion of all true hope, Moltmann rejects romantic and Marxist utopian ideas for attempting to establish hope in human community. (religion-online.org)