1 Now the LORD had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee:
2 And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
3 And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.
4 So Abram departed, as the LORD had spoken unto him; and Lot went with him: and Abram was seventy and five years old when he departed out of Haran.
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Abraham is 75 years old. However one regards that number, he is plainly already at an unsuitable age to pull up stakes and go into the unknown. If we remember other examples, Peter is over forty, an age when it is considered that a person should have everything settled. John, on the other hand, is far too young to decide anything.
Whoever we look at, there is no age suitable for answering the voice of God. We can never be responsible enough, wise enough, good enough to get up and go to the mountain, to another land, into complete uncertainty, in order to see what it is not yet possible even to speak about.