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Aunque ligado necesariamente a la naturaleza, el hombre es al mismo tiempo libertad capaz de diferenciarse de lo material y infinito y solvente para proyectarse hacia valores espirituales e infinitos. De esto trata este libro: de la persona humana y su relación con Dios, sin la que es un ser sin sentido. El vehículo que el autor emplea para realizar esta tarea son frases breves e incisivas escritas en los muros de diferentes pueblos y ciudades, pues, a veces, Dios escribe en las paredes. Deliberadamente, esta miscelánea de ensayos se plantea de manera que algunos se desarrollan a partir de experiencias autobiográficas, pero, sobre todo, de experiencias reales de otros protagonistas, pues los testimonios dan al relato un sentido de veracidad y autenticidad mayor que el de los argumentos, ya que dejan traslucir la vida vivida. También premeditadamente, el autor procura hablar lo imprescindible, a fin de dejar que lo hagan autoridades inmunes al desgaste, de novedad permanente, y con la capacidad de decir cada vez más a mayor número de personas.
Angel Guerra Sierra
Madrid (1947). Doctor en Biología por la Universidad de Barcelona. Profesor de Investigación jubilado del CSIC. Experto en Ecología Marina, temática en la que ha publicado cerca de 300 artículos científicos en revistas nacionales e internacionales. Autor de 9 libros y 30 capítulos en libros colectivos. Del Consejo Editorial de cuatro revistas de investigación. Numerosos artículos de divulgación en ecología marina y medio ambiente. Más de 200 presentaciones orales en congresos y reuniones. Investigador Principal o participante en 43 proyectos de investigación. Profesor de Postgrado y Master en las tres universidades gallegas. Director de 22 Tesis Doctorales y varios trabajos fin de carrera y masters. Ha impartido más de 50 conferencia invitadas en universidades y centros de investigación de Europa América, Australia y Asia. Jefe de 15 expediciones científicas en el Mediterráneo, Atlántico y Pacífico. Asesor de varias organizaciones internacionales (FAO, ICES, CECAF, etc.). Fundador y Socio de Honor del Cephalopod International Advisory Council (CIAC) y de la Sociedad Española de Malacología. Ha recibido varios premios de investigación. En su tarea de defensa de la dignidad humana y la bioética ha publicado 11 libros y numerosos artículos en revistas. Actualmente es el presidente de la Asociación Gallega de Bioética (AGABI).
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