From “The Attributes of God” by A.W. Pink, “The Solitariness of God”, monergism.com copy:
God was under no constraint, no obligation, no necessity to create. That He chose to do so was purely a sovereign act on His part, caused by nothing outside Himself, determined by nothing but His own good pleasure; for He “worketh all things after the counsel of His own will” (Eph. 1:11). That He did create was simply for His manifestative glory. Do some of our readers imagine that we have gone beyond what Scripture warrants? Then we appeal to the Law and the testimony: “Stand up and bless the LORD, your God, for ever and ever; and blessed be thy glorious name, which is exalted above all blessing and praise” (Neh. 9:5). God is no gainer even from our worship. He was in no need of that external glory of His grace which arises from His redeemed, for He is glorious enough in Himself without that. What was it that moved Him to predestinate His elect to the praise of the glory of His grace? It was “according to the good pleasure of His will” (Eph. 1:5).