| Introduction | |
| Numbers and Number Systems | 3 |
| The Heritage of the Pythagoreans | 11 |
| Gnosis and Cabala | 16 |
| Islamic Mysticism | 18 |
| Medieval and Baroque Number Symbolism | 19 |
| Superstitions | 25 |
| Number Games and Magic Squares | 27 |
| A Little Dictionary of Numbers | |
| One | The Number of the Primordial Being | 41 |
| Two | Polarity and Division | 46 |
| Three | The Embracing Synthesis | 58 |
| Four | The Number of Material Order | 86 |
| Five | The Number of Life and Love | 105 |
| Six | The Perfect Number of the Created World | 122 |
| Seven | The Pillars of Wisdom | 127 |
| Eight | The Auspicious Number | 156 |
| Nine | The Magnified Sacred 3 | 164 |
| Ten | Completeness and Perfection | 180 |
| Eleven | The Mute Number | 189 |
| Twelve | The Closed Circle | 192 |
| Thirteen | Lucky or Unlucky? | 203 |
| Fourteen | The Number of the Helpers | 209 |
| Fifteen | A Little Lunar Number | 213 |
| Sixteen | Symbol of Wholeness | 216 |
| Seventeen | Number of Conquest | 219 |
| Eighteen | The Double Nine | 222 |
| Nineteen | The Number of the Metonic Cycle | 224 |
| Twenty | An Old Limit of Counting | 226 |
| Twenty-one | Perfection | 230 |
| Twenty-two | The Hebrew Alphabet | 231 |
| Twenty-four to Thirty-nine | 235 |
| Forty | Preparation and Completion | 245 |
| Forty-two to Sixty-six | 254 |
| Seventy and Seventy-two | Plenitude | 263 |
| Up to Ten Thousand | 269 |
| Bibliography | 281 |
| Illustration Credits | 297 |
| Index | 299 |