For he is our God; and we are the people of his pasture, and the sheep of his hand. To day if ye will hear his voice, harden not your heart, as in the provocation, and as in the day of temptation in the wilderness. Psalm 95:7, 8.
No man can even once devote his God-given powers to the service of worldliness or pride without placing himself on the enemy’s ground…. Every repetition of the sin weakens his power of resistance, blinds his eyes, and stifles conviction….
The Lord sends us warning, counsel, and reproof, that we may have opportunity to correct our errors before they become second nature. But if we refuse to be corrected, God does not interfere to counteract the tendencies of our own course of action. He works no miracle that the seed sown may not spring up and bear fruit. That man who manifests an infidel hardihood or a stolid indifference to divine truth, is but reaping the harvest which he has himself sown. Such has been the experience of many. They listen with stoical indifference to the truths which once stirred their very souls. They sowed neglect, indifference, and resistance to the truth; and such is the harvest which they reap. The coldness of ice, the hardness of iron, the impenetrable, unimpressible nature of rock—all these find a counterpart in the character of many a professed Christian. It was thus that the Lord hardened the heart of Pharaoh. God spoke to the Egyptian king by the mouth of Moses, giving him the most striking evidences of divine power; but the monarch stubbornly refused the light which would have brought him to repentance. God did not send a supernatural power to harden the heart of the rebellious king, but as Pharaoh resisted the truth, the Holy Spirit was withdrawn, and he was left to the darkness and unbelief which he had chosen. By persistent rejection of the Spirit’s influence, men cut themselves off from God. He has in reserve no more potent agency to enlighten their minds. No revelation of His will can reach them in their unbelief.
Unbending principle will mark the course of those who sit at the feet of Jesus and learn of Him.
From: Our High Calling – Page 160