By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went.
Hebrews 11:8

When God tells you to do something that doesn't make a lot of sense to your natural mind and, yet, you step out and do it, you have shown that you have total confidence in God. You believe God and trust Him with your life; therefore, you obey Him.

God called Abram to go to a place where he would receive for an inheritance. When Abram departed, he didn't even know where he was going. This is similar to God speaking to you right now, telling you to pack up everything you have, get in your car, and get on the road, and he will tell you what to do after you do that.

Can you imagine God telling you to go, and then setting out, not knowing where you are going? You would obey only because of faith.