'Ignorance' in the Bible

“Now, brothers, I know that you acted in ignorance [not fully aware of what you were doing], just as your rulers did also.

Therefore God overlooked and disregarded the former ages of ignorance; but now He commands all people everywhere to repent [that is, to change their old way of thinking, to regret their past sins, and to seek God’s purpose for their lives],

for their [moral] understanding is darkened and their reasoning is clouded; [they are] alienated and self-banished from the life of God [with no share in it; this is] because of the [willful] ignorance and spiritual blindness that is [deep-seated] within them, because of the hardness and insensitivity of their heart.

even though I was formerly a blasphemer [of our Lord] and a persecutor [of His church] and a shameful and outrageous and violent aggressor [toward believers]. Yet I was shown mercy because I acted out of ignorance in unbelief.

but into the second [inner tabernacle, the Holy of Holies], only the high priest enters [and then only] once a year, and never without [bringing a sacrifice of] blood, which he offers [as a substitutionary atonement] for himself and for the sins of the people committed in ignorance.

[Live] as obedient children [of God]; do not be conformed to the evil desires which governed you in your ignorance [before you knew the requirements and transforming power of the good news regarding salvation].