J.I. Packer writes:

If we ask what in a nutshell was God revealing in the biblical period, several things must be said together.

First, God was revealing Himself. He was showing His ‘eternal power and deity’ (Rom. 1:20) as maker and master, and with that His character and His ways with men (see Exod. 34:6f.; 5:9f.; Jer. 9:24; 1 John 1:5; 4:7-10), so that He might be acknowledged and worshipped for all that He is and does and gives.