"Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves."
Rather than stick with the same text, I thought I'd find similar alternate texts to deal with the next two parts. This devotion deals with the point Christ makes that the sheep of the Good Shepherd can distinguish his voice from other voices.
It is rather easy for Christians to point out glaring, blatant, non-Christian heresy but what about the finer points of Christian Doctrine? How are we to know what is wrong or what is right? Here Christ gives us comfort amongst the world's confusion. In John 10:5 Jesus says, "But they will never follow a stranger; in fact, they will run away from him because they do not recognize a stranger's voice."
This is not to reinforce the notion of 'once saved always saved' However it is the comfort that sheep who know the voice of the Good Shepherd will be able to distinguish other voices from his. This is not of our doing, but it is the power of the Holy Spirit who gives and strengthens our faith. As our faith is strengthened it has the ability to cut away the weeds that spring up around us. So that the seed sown on fertile ground will not be choked away by thorns.