The Measure of One's Self

I look at my date of birth
And measure my growing girth
I realize that my age and size
Are really of little worth
To measure my value
And to find what is true
I need to look within
Measuring both vice and virtue
Separating the good from sin
Looking honestly at myself
Trying to see what God does see
I realize I am very small
I haven't been what I could be