\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[10pt]{type1ec}
\usepackage{txfonts}
\usepackage{soul}
\usepackage[polutonikogreek,german]{babel}
\newcommand{\titel}{\section}
\newcommand{\untertitel}{\subsection}
\newcommand{\dasheisst}{d.\,h.\ }
\newcommand{\zumbeispiel}{z.\,b.\ }
\newcommand{\letterspace}{\so}
\begin{document}
   \input jg_kl_1_ursprung.txt
\end{document}