Celebrating the 100th anniversary of Edgar Morin, we must remember his contribution to the modern thought. Complexity does not mean elimination of simplicity – on the contrary, evolves everything which gives order, clarifies, precises and distinguishes the process of knowledge. In what concerns complexity and completion, we must say that they are different. We have to speak about multidimensional knowledge, which presupposes the comprehension of the principles of imperfection, incompletion, and uncertainty. The present crisis is diverse: ecological, with the destruction of biosphere; demographic, by the coexistence between the growth of population in the poor countries and the reduction and ageing in the richest countries, with development of migrations due to poverty; urban, because of megacities highly agents of pollution, with ghettoes of rich people and of poor people; agricultural, because of rural desertification, urban centralism and development of industrialized monocultures; also political, because of the incapacity of thinking and of assuming new realities and the complexity of problems; and also concerning religions with less laicity and the contradictions that are against the principles of universal fraternity. The idea of unlimited growth must give place to new perspectives not only economic and financial but social and axiological.