What is Impossible?

Hey Guys. So a new challenge has very recently been thrown at us. (More details to come very soon.) I am very scared. Dan has complete peace with God about it. But mine just isn't there yet. I am finding some comfort in this:

Matthew 17:20
He replied, "Because you have so little faith. I tell you the truth, if you have faith as small as a mustard seed, you can say to this mountain, 'Move from here to there' and it will move. Nothing will be impossible for you."

Matthew 19:26
Jesus looked at them and said, "With man this is impossible, but with God all things are possible."

Mark 10:27
Jesus looked at them and said, "With man this is impossible, but not with God; all things are possible with God."

Luke 1:37
For nothing is impossible with God."

Luke 18:27
Jesus replied, "What is impossible with men is possible with God."

Please pray for us, that God will come through. I know He is faithful, and that He is always with us. I think Satan is just trying to discourage me. Please just pray. Thanks guys!