To know your calling

I recall the example from Kathy Walter's ministry.

She gave the example of a missionary brought up in a missionary home who in fact his purpose was to be a business person and earn money for God. But because he wasn't in the right environment, he was not aware of his calling until he entered into business.

The other example she gave was this lady whose dream was to take care of other people's cats. So she was aware of her calling since God had planted the desire into her heart.