Analysis of At the door

I thought myself indeed secure,
 So fast the door, so firm the lock;
But, lo! he toddling comes to lure
 My parent ear with timorous knock.

My heart were stone could it withstand
 The sweetness of my baby's plea,--
That timorous, baby knocking and
 "Please let me in,--it's only me."

I threw aside the unfinished book,
 Regardless of its tempting charms,
And opening wide the door, I took
 My laughing darling in my arms.

Who knows but in Eternity,
 I, like a truant child, shall wait
The glories of a life to be,
 Beyond the Heavenly Father's gate?

And will that Heavenly Father heed
 The truant's supplicating cry,
As at the outer door I plead,
"'T is I, O Father! only I"?