The eggshell is an important layer of protection
To the growing embryo that is within the egg
Which implies that the shell's function
is to support the embryo's growth

However, when the embryo grows & turns to a chick,
The shell (of protection) now becomes a barrier
That the chick needs to peck & break through
In order to live to its full potential

That's a true story of how
The thing that provides comfort  
Later turns to act as a limitation.
What is that comfort that you've enjoyed
But is now holding you back
From being the person you ought to be
Maybe it's time to peck, to break through
And become who you were made to be!