When we are very young dependence on others is vitally important. As dependents we spend our waking hours soaking up information and being influenced by other "wiser" people, but time brings about growth and maturity. In every phase of our life we learn the importance knowledge and maturity play in every day interaction with other people and in self reliance. A definition of self reliance is "reliance on one's own powers and resources rather than those of others." As Christians we need to be careful that we are growing into mature people that can "carry our own weight". Of course we should not reach the point where we begin boasting about ourselves or assuming it is our own doing that makes salvation work. We will always rely on God's mercy and the sacrifice His Son suffered for us on the cross.
Self-reliance is a quality of the mature. In the scriptures Paul continually exhorts Christians to strive toward maturity so that we will be able to relay the truth to others with boldness. The fact that we will be tested and debated is the sobering reality of those that believe that there is a God and that Jesus, His Son, came to earth living a perfect life and giving up that life as a sacrifice granting us the hope of salvation. We cannot rely on others to win our place in heaven for us, for us to be sure of our salvation we will need self-reliance.