5107. 'Do not interpretations belong to God?' means that the Divine is within them. This is clear from the meaning of 'the interpretation', when used in reference to dreams, as that which these hold within them, as just above in 5105 - that which is Divine being meant by 'God'.

5105. 'And there is no interpreter for it' means that no one knows what they hold within them. This is clear from the meaning of 'the interpretation' as the explanation of what something holds within it, dealt with above in 5093, and so of what those dreams held within them.