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Shiavault - a Vault of Shia Islamic Books A Compilation of Islamic Philosophy and Theology [edited] Chapter Five: Necessity, Impossibility, and Possibility In this chapter terms such as ‘necessity’, ‘impossibility’, ‘necessity by essence’, ‘impossibility by essence’, ‘possibility by essence’, ‘necessity by others’, and ‘impossibility by others’ are introduced.

Therefore, we start our discussion by giving a brief and indefinable concept in philosophy, and then we will try to explain these terms in the light of the two self-evident concepts of existence and non-existence.

Necessity If we consider such items as ‘flower’, ‘even’, ‘white’, ‘sweet’, and ‘eight’, we will see that among these items only ‘even’ can be related to ‘eight’, and ‘white’ to ‘flower’, and these relationships are reflected in the mind of man in the two statements of ‘eight is even’ and ‘flower is white’.

No doubt because ‘even’, ‘sweet’ or ‘eight’ have nothing in common with ‘flower’, or ‘flower’, ‘white’, or ‘eight’, or finally ‘white’, ‘sweet’, and ‘even’ with each other, there can exist no statement in our mind describing their relationship, such as ‘eight is sweet’ and so on.

In other words, the statement ‘eight is an even number’ expresses the relationship between the attribute ‘even’ and the number eight and the statement ‘the flower is white’ indicates the relationship between the attribute ‘white’ and the flower. Now we turn our attention to the two mentioned relationships. It is clear that the attribute ‘even’ and the number eight, unlike the attribute ‘white’ and the flower are inseparable related to each other.

We cannot imagine any number eight that is not even. However, we can imagine a flower that is not white, or even imagine certain states and conditions where the white flower loses its whiteness and acquires another colour. In philosophical terms it is said that the relationship between ‘white’ and ‘flower’ is unnecessary.

We can also put the necessity or non-necessity of this relationship in a statement, and say, for example, “Eight is necessarily even,” and “Flower is white but unnecessarily.” In these two statements, besides showing the relationship, we have identified its kind. In technical terms, words such as ‘necessity’ or ‘non-necessity’, which show the kind of relationship, are called ‘modes’.