“Now when they saw the boldness of Peter and John, and perceived that they were uneducated, common men, they were astonished. And they recognized that they had been with Jesus.”
Acts 4:13 ESV

Boldness! Peter, “filled with the Holy Spirit” spoke with boldness. Even when arrested and brought before the powerful religious leaders, Peter and John were not afraid.They continued to testify of Jesus and His salvation. This boldness gave evidence to the council of a fact. These men had been with Jesus!
Peter and John were “common men,” fishermen. They were “uneducated.” They were not the elite But there was one characteristic that stood out about them, “they had been with Jesus.”
When we live our lives surrendered to the Holy Spirit, filled with Him, it will be evident that we have been with Jesus as well. The same Holy Spirit, that enabled Peter and John to be bold and to display Jesus in their lives, desires to fill us and give us boldness as well.
After the council released Peter and John, they went to their friends and prayed. They asked for God to continue to grant them boldness so they could continue to speak His Word “with all boldness, while {He stretched} out {His} hand to heal, and signs and wonders {were} performed through the name of {His} holy servant Jesus.” (Verse 30) When they prayed the place was “shaken” and “they were all filled with the Holy Spirit and continued to speak the word of God with boldness.” (Verse 31) With great power they testified of the resurrection of Jesus. (Verse 33)
We have a purpose in our lives. We are to know God and to make Him known. Peter and John gave evidence that they had been with Jesus, they knew Him. Everywhere they went they witnessed of Him, made Him known. God’s purpose for us has not changed! What God has called us to He will empower us to do! He longs to fill us with His Holy Spirit so that we can be witnesses! We can proclaim the Word of God with Boldness through the power of the Holy Spirit!