Adam Clarke on Proverbs 8:30

Then I was with him, as one brought up - אמון amon, a nursling, a darling child. Wisdom continues its parable, says Calmet; and represents itself as a new-born child which is ever near its parent, and takes pleasure to see him act, and to sport in his presence. This is poetical and highly figurative; and they who think they find the deity of Jesus Christ in these metaphors should be very cautious how they apply such terms as these; so that while they are endeavoring to defend the truth, they may do nothing against the truth, in which most of them unhappily fail.

Rejoicing always before him - All the images in this verse are borrowed from the state and circumstances of a darling, affectionate, playful child; as any one will be convinced who examines the Hebrew text.