Why is G-d referred to in the plural in the book of Genesis?
The plural (for example, in Genesis 1:26) has been the source of wonder for most of the commenators. One answer is that G-d wanted to teach a personality trait to man. Therefore, even though He didn’t require their input into the decision, G-d turned to the angels and asked them if they would participate. This act of respect thereby became a fundamental feature of human composition.