Focusing our eyes on God is good:
A) In and of itself.
God is infinite in all perfections and thus infinite and beauty. Infinite beauty is infinitely satisfying. Thus focusing on God is perfect in and of its self.
B) For its consequences.
Focusing on God causes us to become more like God. We become more like God in our beauty and perfection when we focus upon him. Thus focusing on God is perfect for its consequences.
If focusing on God is perfect in goodness in and of itself and perfect for its consequences that only folly would make us not cast our eyes long and hard upon God. That folly is sin and it seeks to shortchange us of life's greatest pleasure: namely satisfaction in God.