In the introduction Keller writes, 'Why this book? The simple answer to that blunt question is that often outdoors flashes of inspiration come with brilliant illumination in a matter of moments. Suddenly, swiftly, clear spiritual perception of profound truth sweeps into my own spirit like an artist's painting in vivid colors. THE IMPRESSION COMES IN AN INSTANT BUT ENDURES FOREVER. THESE MOVING OUTDOOR MOMENTS STIR MY SOUL.'
