Why man cannot have wings?

If man had wings,
No land would have a title,
No boundary defined,
We would fly restless looking at the sky,

But when everyone else flies,
Crowded seem the heaven,
And God cannot look down,
We would appeal selfish with no divine right,
To be called birdman or winged-man,

If man had wings, alas, forfeit a dream,
To see our sins landed and our ego high,
With us lays our desires,
From us escapes our lies,
We turn to see our failures petrified,