They will continue to grow stronger,
and each of them will appear before God in Jerusalem.

– Psalm 84:7 NLT

What made weak followers of Jesus stronger after his resurrection and ascension?

How is it that the faith of eleven remaining Disciples and a few former followers grew into a boldness in Christ that could not be silenced even by threat of death?

Acts 2:

40 And with many other words he bore witness and continued to exhort them, saying, “Save yourselves from this crooked generation.” 41 So those who received his word were baptized, and there were added that day about three thousand souls.

42 And they devoted themselves to the apostles’ teaching and the fellowship, to the breaking of bread and the prayers…

Acts 3: Now Peter and John were going up to the temple at the hour of prayer, the ninth hour…

Acts 4:4 But many of those who had heard the word believed, and the number of the men came to about five thousand.

5 On the next day their rulers and elders and scribes gathered together in Jerusalem, 6 with Annas the high priest and Caiaphas and John and Alexander, and all who were of the high-priestly family. 7 And when they had set them in the midst, they inquired, “By what power or by what name did you do this?” 

[They are referring to a lame man present healed by a miracle of God.]

13 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.

It is one thing to have been with Jesus. It is quite another to have the power of Jesus with you.

And for you and me, even now, it is one thing to know about Jesus. It is quite another to have the boldness of the Spirit with you.

These humble followers of Jesus, weak vessels of flesh who would even deny Jesus as they crucified Him, now seem fitted for the battle; and the battle is the LORD’s.

“REPENT! and be baptized,” is the battle cry of the believer.

Turn from your sinful ways and receive the permanent change of the Spirit of God. This is the invitation of the Lord to sinners everywhere and in every time… this mortal time of our sinful flesh and perishing souls.

It would seem that these Disciples were now well suited in an armor even more threatening to a chosen nation of conquered men.

A letter to the church at Ephesus from a soon-to-be converted Saul of Tarsus (the Apostle Paul):

The Whole Armor of God

Ephesians 6:10 Finally, be strong in the Lord and in the strength of his might. 11 Put on the whole armor of God, that you may be able to stand against the schemes of the devil. 12 For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places. 13 Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm.

14 Stand therefore, having fastened on the belt of truth, and having put on the breastplate of righteousness, 15 and, as shoes for your feet, having put on the readiness given by the gospel of peace.

16 In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one; 17 and take the helmet of salvation, and the sword of the Spirit, which is the word of God, 18 praying at all times in the Spirit, with all prayer and supplication.

To that end keep alert with all perseverance, making supplication for all the saints, 19 and also for me, that words may be given to me in opening my mouth boldly to proclaim the mystery of the gospel, 20 for which I am an ambassador in chains, that I may declare it boldly, as I ought to speak.