Hebrews 3:7-8  gives a stern warning, "The Holy Spirit says, 'Today if you hear His voice, do not harden your hearts, as you did in the rebellion, during the time of testing in the wilderness...'"

Matthew Henry's Commentary teaches about this verse  that "the hardening of the heart is the spring of all other sins." He further goes on to describe the effects of a hardened heart "...once we allow ourselves to distrust God, we may soon desert him." Think a little about the dynamics the Jews had with God in the Old Testament. God was constantly moving in supernatural way, He was continually revealing Himself to His people, and yet, time after time the Jews turned away from God.

If we're honest, at time we're not different than the Jews were. If  we pay attention, the Holy Spirit is constantly speaking to us and challenging our hearts, but it is easy to miss out on or to simply ignore it. God wants to reach right down into our hearts, so we in return can reach out to the world.  God wants to make us uncomfortable so that we learn to rely on Him and so that our faith and testimonies point the world directly to Him. If we start forming the habit of asking God to show us small ways to show people His love, He'll start moving in huge and unimaginable ways. God wants me to reach out and love the world, and He's always communicating ways to do so. His methods will vary, but He's always at work, He's always guiding our path, He's always nudging us to let Him use us to show the world His glory.  And the cool part about it is, God doesn't just use these situations to help others- He uses them to shape us, to heal us, to build us up and edify us, and ultimately, to make us a little more like Jesus.