36 Preface سُبحانَ الَّذي خَلَقَ الأَزواجَ كُلَّها مِمّا تُنبِتُ الأَرضُ وَمِن أَنفُسِهِم وَمِمّا لا يَعلَمونَYusuf AliGlory to God, Who created in pairs all things that1 the earth produces, as well as their own (human) kind and (other) things of which they have no knowledge.The mystery of sex runs through all creation-in man, in animal life, in vegetable life and possibly in other things of which we have no knowledge. Then there are pairs of opposite forces in nature, e.g., positive and negative electricity, etc. The atom itself consists of a positively charged nucleus of protons, surrounded by negatively charged electrons. The constitution of matter itself is thus referred to pairs of opposite energies.