Concurrence is when two actions occur simultaneously, or concurrently. It means that God is good and absolutely sovereign over all things, yet at the same time, we are not puppets or robots but have real choices and willingly exercise our wills. Furthermore, we are responsible for our actions and suffer real consequences for them. The Bible teaches all of these ideas repeatedly, emphatically, and concurrently. The challenge for us is to avoid choosing one truth over another, and instead hold them all simultaneously.
~Carolyn Custis James, When Life and Beliefs Collide