There is a passage in scripture In Psalms 139 from which this quote is taken.
The passage states
13 For You (GOD) formed my inward parts;
You covered me in my mother’s womb.
14 I will praise You, for I am fearfully and wonderfully made;
Marvelous are Your works,
And that my soul knows very well.
15 My frame was not hidden from You,
When I was made in secret,
And skillfully wrought in the lowest parts of the earth.
16 Your eyes saw my substance, being yet unformed.
And in Your book they all were written,
The days fashioned for me,
When as yet there were none of them.
17 How precious also are Your thoughts to me, O God!
How great is the sum of them!
18 If I should count them, they would be more in number than the sand;
New King James Version
A brief video to which we are linking today expands on this thought.
HERE'S THE LINK to Fearfully and Wonderfully Made