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.—Psalm 139:16
As with Jeremiah and David whose call came before entering into their mother's womb, so it is with every man and woman born. However, through the provision of free will, God has left it to each one's choosing as to whether or not that call will be lived out. Jesus said it Himself:
For many are called, but few are chosen.—Matthew 22:14
The choosing comes by the decisions we make along the way as to whether or not we are able to be a resting place for the fullness of His glory. He will not put on us that which we are not prepared to carry, lest it destroy us. Destiny calls each one of us, and it is the exercising of our free will that determines the outcome of that calling. As our hearts continually respond to the voice of our Creator, "I choose You! Above all else, I choose You!" we navigate our way through our destiny.