And just like true love drives out all fear (1 John 4:18),
fear exposes fake, superficial love.
And in the end times, FEAR will be rampant and out of control.
The Bible says that a hard heart is an unbelieving heart. A hard heart is unresponsive towards God's word and mercy. It is a heart that is unconvinced of God's goodness and is cold toward God and His people.
Do not harden your hearts as in the rebellion, on the day of testing in the wilderness,
--- Hebrews 3:8
And we know from scripture that greed can cause a hard heart.
(Ephesians 4:18-19)
Moreover, a hard heart is characterized by a lack of discernment and understanding of spiritual things, often extending into the physical realm. The result is an inability to perceive spiritually the things of God.
Jesus often said,
"He who has ears to hear, let him hear." --- Matthew 11:15
And quoting Isaiah, Jesus says,
"For the hearts of these people are hardened, and their ears cannot hear, and they have closed their eyes— so their eyes cannot see, and their ears cannot hear, and their hearts cannot understand, and they cannot turn to me and let me heal them."
--- Matthew 13:15
But because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath when God's righteous judgment will be revealed. --- Romans 2:5
Blessed is the one who fears the Lord always, but whoever hardens his heart will fall into calamity. --- Proverbs 28:14