God requires holiness from HIS men

In the story of Gideon in Judges 6 we see that Gideon offered a sacrifice to know if it is God who is speaking to him. In verses17-19 - 17 Gideon replied, "If now I have found favor in your eyes, give me a sign that it is really you talking to me. 18 Please do not go away until I come back and bring my offering and set it before you." And the LORD said, "I will wait until you return." 19 Gideon went in, prepared a young goat, and from an ephah [b] of flour he made bread without yeast. Putting the meat in a basket and its broth in a pot, he brought them out and offered them to him under the oak.

In the New Testament the unleavened bread is symbolic of a holy life. We see that in ICor5:7-9. Paul likens the unleavened bread to sincerity and truth in vs 8.

When God chooses his men he requires them to offer him 'unleavened bread' which is a holy life. Just like the way Gideon went inside to make the unleavened bread while the LORD said, "I will wait until you return" (Judg6:18) He also waits untill the man he has chosen offers a life of holiness. Look at Jesus' life. Before he started his ministry, before God's hand could be mightily manifested in his ministry he had to go to the wilderness to be tempted. It was the same with Paul. He was sent to Tarsus (Acts9:30). God waits for His man to offer a holy life and then He'll come and manifest his hand upon his ministry with fire just like the fire consumed Gideon's offering on the rock. When Gideon saw that fire consumed his offering he knew that it was God who called him.

If you know you are chosen by God and are still not seeing his hand in your life, then he is waiting for you to offer a holy life as an offering. It could take years but God waits. He said to Gideon "I will wait untill you return" and He says the same to us. Once you've offered the offering of holy life God's fire will be upon your work and everyone will know that it is so.