Our Greatest need is for the power promised in the latter rain (a last day account of Pentecost).Through the Holy Spirit many signs and wonders will take place. A mighty work will be done and thousands will accept Christ and be converted. Through the power of the Spirit even the uneducated will speak forth words with boldness and clearity. Just as in Bible times, simple methods inspired by God will bring powerful results. Through signs and wonders God will make it known to all that He is in control of finishing the work of the gospel. Under the power and direction of God the gospel will then be preached to the whole world and Christ will come.
Ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me... Acts 1:8
And when they had prayed… they were all filled with the Holy Ghost, and they spake the word of God with boldness. Acts 4:31
Then Peter said unto them, Repent, and be baptized every one of you... Then they that gladly received his word were baptized: and the same day there were added [unto them] about three thousand souls. Acts 2:38-41
And as they spake unto the people… many of them which heard the word believed; and the number of the men was about five thousand. Acts 4:1,4
And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance. And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven. …every man heard them speak in his own language. And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans? And how hear we every man in our own tongue, wherein we were born? Acts 2:4-8
And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover. Mark 16:17-18
And fear came upon every soul: and many wonders and signs were done by the apostles. Acts 2:43
The gospel commission will never be finished without the power of the latter rain.
…without me ye can do nothing. John 15:5 This is the word of the LORD… saying, Not by might, nor by power, but by My Spirit, saith the LORD of hosts. Zechariah 4:6
Source: http://ourgreatestneed.org/powerhs.htm