In these 2 verses, the Psalmist is giving glory to God for life.  As I sit back and picture what God has done in my life, I am overflowing with gratitude to God for giving me many many many things - for creating me, for giving me life, for sustaining my life, for giving me Christ who saved me from my sins, for giving me the Holy Spirit that guides me, and for giving me the Bible in my own language that I can read and understand the truth.
 
Psalm 139:13-14
For You 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.