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There is no greater mockery than to call a sinner a free man. Show me a convict toiling in the chain gang, and call him a free man if you will; point out to me the galley slave chained to the oar, and smarting under the taskmaster’s lash whenever he pauses to draw breath, and call him a free man if you will; but never call a sinner a free man, even in his will, so long as he is the slave of his own corruptions. In our natural state, we wore chains, not upon our limbs, but upon our hearts, fetters that bound us, and kept us from God, from rest, from peace, from holiness, from anything like freedom of heart and conscience and will. The iron entered into our soul; and there is no slavery as terrible as that. As there is no freedom like the freedom of the spirit, so is there no slavery that is at all comparable to the bondage of the heart." ~Spurgeon
"'Who then can be saved?' But Jesus looked at them and said to them, 'With men this is impossible, but with God all things are possible.'" (Mt. 19:25-26)
"No one can come to Me unless the Father who sent Me draws him" (John 6:44)
"No one can come to Me unless it has been granted to him by My Father." (John 6:65)