Isaiah 63

"O Lord, why have You made us stray from Your ways,
And hardened our heart from Your fear?
Return for Your servants’ sake,
The tribes of Your inheritance." v.17

Read chapter 63

This is a question still asked by many today: "why has the Lord made us stray from His ways and hardened our hearts"?  Isaiah identifies himself with his people, and speaks for them. "Have their sins led God to abandon them, and to harden their hearts as He hardened Pharaoh’s? (Comp. Romans 9:17-22.) Are they given over as to a reprobate mind? Against that thought he finds refuge, where only men can find it, in prayer, and in pleading God’s promise and the “election of grace,” to which He at least remains faithful, though men are faithless. Conscious that they have no power without Him to return to Him, they can ask Him to return to them" (Elliott's Commentary).

2 Timothy 2:13 is the great promise and characteristic of God that if we are faithless God remains faithful.  It's hard to understand why God would harden someone's heart but like in the case of Pharaoh, he hardened his own heart before God chose to do so.  We point the finger at God when really it's out of our free will that we stray from God's ways and choose not to fear Him and God allows us in that.  When have you blamed God for something that was ultimately your choosing?