In a recent conversation Kasey Tinsley shared with me a line that she attributed to E. Dean Cook; "A Ship needs a burden to sail." (E. Dean Cook is a retired chaplain from the US Navy.)
Just like a ship needs a burden to sail, so a person needs a burden to have an impact, to move, to accomplish something. It's no surprise that Jesus would invite us to lay our burdens down and pick up His cross. His cross is a burden, a holy burden that leads to real significance.