honor that Almighty God has assigned.  Jesus' ministry came as no easy road.  Neither was the ministry of the apostles easy.  It was a prize to be won with great effort.

14: I press toward the mark for the prize of the high calling of God in Christ Jesus.
15: Let us therefore, as many as be perfect, be thus minded: and if in any thing ye be otherwise minded, God shall reveal even this unto you.
 

Moses was called out of the midst of a burning bush that was not consumed.  God took great care to present the right circumstances to attract his attention and cause him to know that it was God that was speaking. There was no power that could set a flame in earthly matter and speak through it,  without defacing that matter.  After this supernatural physical phenomena, the voice of the only potentate, the Almighty God of His fathers spoke through the flames. The scripture says Moses turned aside to see the sight.  It was then that Jehovah God began to speak out of the burning bush that did not burn.

Ex: 3:3: And Moses said, I will now turn aside, and see this great sight, why the bush is not burnt.
Ex: 3:4: And when the LORD saw that he turned aside to see, God called unto him out of the midst of the bush, and said, Moses, Moses.  And he said, here am I.

We must not only be called, but we must be sent.  This is God time table.  Moses waited 80 years until he was sent.  David was called to the kingdom and afterward suffered as an enemy of the Kingdom of God's people.  He was called to rule as king, but was tagged as an enemy of the King.  Eventually God sent him do the job, removing the former king and uniting the kingdom under David's rule and authority.

The Lord will make sure that you know that it is He that is speaking to you, especially on such an important matter.

The Lord may even have someone to confirm the blessing you are to be to the kingdom of God. He will confirm His word to you, no matter the nature of it.   Don't be afraid to try the Spirit.  He has used the voices of spiritual authorities, pastors and prophets, people you don't know, even don't