'Perfect' in the Bible

As for you, you have an anointing from the holy One and have perfect knowledge.

Now, little children (believers, dear ones), remain in Him [with unwavering faith], so that when He appears [at His return], we may have [perfect] confidence and not be ashamed and shrink away from Him at His coming.

Dear friends, if our hearts do not condemn us, we have perfect confidence towards God;

Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world.

There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.