In the process of time, God raises up "sons" to respond to the condition of the world and the cries of humanity at different events throughout the ages. We see this with Noah, Abraham, Joseph, Moses and many others. Sons and daughters are called by God and equipped by the Holy Spirit to fulfill the purpose for which they were created. So the question becomes, "what need must I respond to?" Your scale or stage may not be as grand as Joseph's or that of Moses but it is equally important because it is ordained by God. Walking requires movement and direction is a necessity to reach your God-assigned destiny. 

Exodus 3:7-10