Eyes, Ears and Heart
"But to this day the LORD has not given you a heart to understand or eyes to see or ears to hear." - Deut 29:4.
And yet, even after reading this, some still think they can have these things without God granting them. Perhaps if they try hard enough. Indeed, by nature people have a will ... and they can make a choice ... but they need regenerating grace to make the RIGHT choice. Without God giving them eyes, ears or a new heart (i.e. full regeneration) the choice is still driven by a spiritually dead man who loves darkness and hates the light (1 Cor 2:14; Eph 2:1; John 3:19, 20) but thanks be to God, while we were still dead God made us alive in Christ (Eph 2:5).
Notice in the very next passge in Deuteronomy God declares this very thing to the children of promise:
"And the Lord your God will circumcise your heart and the heart of your offspring, so that you will love the Lord your God with all your heart and with all your soul, that you may live." Deut 30:6
We must relentlessly pray and repeat the truth of the sufficiency of grace in Christ to the church ... or it will be lost among the ceaseless babble of men as it largely was in the middle ages.