OUTLINE:

"Forensic" at Dictionary.com
pertaining to, connected with, or used in courts of law or public discussion and debate.

Big Picture
The NT letters were written years later to the very same churches the apostles founded and built in the book of Acts!! (i.e. - Paul's missionary trips took him to Galatia, Thessalonica, Ephesus, Corinth, Rome, etc... and he later wrote to them, often defending the Gospel from attacks he heard about)  

2Co 11:3
But I am afraid that, as the serpent deceived Eve by his craftiness, your minds will be led astray from the simplicity and purity of devotion to Christ.

Plainly Stated Doctrine
And they prayed and said, "You, Lord, who know the hearts of all men, show which one of these two You have chosen. Ac 1:24

Sharing the Gospel
"You say you have no sin?? God knows the heart. In fact, Jesus said if you even just THINK something, you've DONE IT in God's eyes. Think maybe you need to repent towards God, my friend?"

Plainly Stated Doctrine
'AND IT SHALL BE THAT EVERYONE WHO CALLS ON THE NAME OF THE LORD WILL BE SAVED.'
Ac 2:21

The mouth without the heart is dangerous territory; that's where the lip service of religion is NOT accepted by the Lord.

His call to us opened our ears and even empowered us to call upon Him to be saved.

Plainly Stated Doctrine
"For the promise is for you and your children and for all who are far off, as many as the Lord our God will call to Himself." Ac 2:39

Man's call out to God to be saved is actually a response to the call of the Holy Spirit. It's the Lord who reaches out to save man. Ac 2:39,47

We Rejoice!
This is supernatural! God's reaching out to the spiritually deaf and convicting man's heart to a response that saves!

Isn't it great to have a Sovereign King who is gracious and kind but yet doesn't accept being mocked? Who's not a pushover and won't be taken advantage of? (i.e. - by lip service)

Our Lord is both Justice and Mercy. He is the Lion and the Lamb. We don't have a King who is weak in any way, "full of grace and truth". Jn 1:14

The Lord calls and saves, and shares His very own Righteousness with those who are humbly willing to drop their own righteousness. Lk 18:9-14

Plainly Stated Doctrine
"For you first, God raised up His Servant (Jesus) and sent Him to bless you by turning every one of you from your wicked ways." Ac 3:26

Lk 5:32
"I have not come to call the righteous but sinners to repentance."

Mk 1:15b
"repent and believe the good news!"

Ac 26:17b-18 NIV
‘I am sending you to them to open their eyes and turn them from darkness to light, and from the power of Satan to God, so that they may receive forgiveness of sins and a place among those who are sanctified by faith in me.'

Plainly Stated Doctrine
"For truly in this city there were gathered together against Your holy servant Jesus, whom You anointed, both Herod and Pontius Pilate, along with the Gentiles and the peoples of Israel, to do whatever Your hand and Your purpose predestined to occur. Ac 4:27-28

Ac 5:29 Truth In Context
This doesn't give us the right to act arrogantly in the face of authorities that are against Christ. On the contrary, it's speaking the truth in love, humbly saying "this is what I must do because God said so".

Mt 10:16
"Behold, I send you out as sheep in the midst of wolves; so be shrewd as serpents and innocent as doves."

God gives His Holy Spirit to those who obey Him. Ac 5:32

Disobedience to the Lord!
Man's main problem has always been a stubborn and unrepentant heart, just like many Jews had in the OT times, and as we have seen in Ro 2:4-5.

A religious confession, without a heartfelt repentance, leaves a person unconverted.

Ac 11:17-18 Plainly States:
If they received the Holy Spirit by believing in Christ, then God must have granted them repentance!!

Man is personally accountable to God in regards to salvation. And if man rejects the grace gift of God, he basically condemns himself. Ac 13:46, Jn 8:23-24

Are you willing to stop living for yourself, trying to make your life all comfortable in this world where you are just visiting???... and simply accept it's your calling to live for Christ, which includes tribulations as we enter the kingdom of God???