呼求主名是基督徒的记号
早期的信徒在各处都呼求主名（林前一2）。对不信的人，尤其对逼迫的人，呼求主名成了基督信徒普遍的记号（徒九14，21）。司提反在遭逼迫时，曾呼求主名（徒七59），这必定使逼迫他的扫罗印象深刻（徒七58-60，二二20）。然后，不信的扫罗以他们的呼求为记号，逼迫那些呼求的人（徒九14，21）。等到他被主得着以后，那把他带进基督身体交通里的亚拿尼亚，立刻嘱咐他要呼求着主的名受浸，向人表明他也成了这样呼求的人。
呼求主名使我们得救并且享受主的丰富
行传二章二十一节乃从十七节开始所引约珥豫言的结语，指明神将祂的灵浇灌在一切属肉体的人身上，结果乃是叫他们藉着呼求主名而得救。神将祂的灵浇灌下来，就是将主的救恩应用在祂所拣选的人身上。得救乃是接受这灵，这灵就是神新约经纶里福音的福（加三2，5，14）。这灵乃是主自己成了我们的气息（约二十22）和活水（约四10，14）。我们要吸入祂作我们的气息，并饮于祂作我们的活水，就需要呼求祂。
哀歌三章五十五至五十六节（英译美国标准本）指明，呼求主就是呼吸；以赛亚十二章三至四节指明，呼求主名就是喝水。我们信主以后，需要呼求祂，使我们不仅得救，更享受祂的丰富（罗十12-13）。我们运用灵呼求祂，吸祂，喝祂，就享受祂的丰富。这才是对神真正的敬拜。主把这敬拜（约四24），联于饮祂所赐的活水（约四14）。
这是神在约珥书所应许的
我们已经看见，彼得在行传二章十四至二十一节，对犹太人的第一篇信息中，解释圣灵经纶的充溢。圣灵这经纶的充溢，乃是神在约珥二章二十八至二十九节、三十二节所应许的。那里说到，神的选民要藉着呼求耶和华的名得救。呼求耶和华的名，在新约中等于呼求主耶稣的名。
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Whoever Calls on the Name of the Lord Shall Be Saved (2) – Joel 2:32
Calling on the Name of the Lord is a Sign of Christians
The early believers practiced this everywhere (1 Cor. 1:2), and it became a popular sign of Christ’s believers toward the unbelievers, especially the persecutors (Acts 9:14, 21). When Stephen suffered persecution, he practiced this (7:59), and his practice surely impressed Saul, one of his persecutors (Acts 7:58-60; 22:20). Then the unbelieving Saul persecuted these callers (Acts 9:14, 21) by taking their calling as a sign. Immediately after Saul was caught by the Lord, Ananias, who brought him into the fellowship of the Body of Christ, charged him to be baptized, calling on the name of the Lord, to show others that he also had become such a caller.
Calling on the Lord’s Name Enables Us to be Saved and Enjoy His Riches
Act 2:21 is the conclusion of the quotation of Joel’s prophecy, which began in verse 17. The fact that verse 21 is the conclusion of the quotation indicates that the issue of God’s pouring out of his Spirit upon all flesh is their salvation through calling on the name of the Lord. God’s outpouring of his Spirit is the application of the Lord’s salvation unto his chosen people. To be saved is to receive this Spirit, which is the blessing of the gospel in God’s New Testament economy (Gal. 3:2, 5, 14). This Spirit is the Lord himself as the breath (John 20:22) and the living water (John 4:10, 14) to us. To breathe him in as our breath and drink him as our living water, we need to call upon him.
Lamentations 3:55-56 indicates that calling upon the Lord is breathing, and Isaiah 12:3 and 4 indicate that calling upon the Lord is drinking. After we believe in the Lord, we need to call upon him so that we may not only be saved but also enjoy his riches (Rom. 10:12-13). His riches are enjoyed through our calling upon him by exercising our spirit. This is the real worship of God (John 4:24). The Lord relates this worship (John 4:24) to drinking the living water he gave (John 4:14).
What God Has Promised in the Book of Joel
We have seen that in 2:14-21 Peter, in his first message to the Jews, explains the economical filling of the Holy Spirit. This economical filling of the Holy Spirit was promised by God in Joel 2:28-29, 32. It says that God’s chosen people will be saved by calling on the name of the Lord. Calling on the name of Jehovah is equivalent to calling on the name of the Lord Jesus in the New Testament.