Our hearts became proud.
Although God has perfected our beauty (Ezek. 27:4)
Our hearts became proud on account of our beauty (28:17).
Although God has given us power to make wealth (Deut. 8:18)
We think that our power and the strength of our hands made us this wealth (v. 17).
And because of our wealth our hearts has grown proud (Ezek. 28:5).