We trust God because we know He loves us.
Everything is His gift, and expresses His personal love for each of us and for the relationships between us. He is Love. He can only love. In the Cross He reveals that He is Love and He gives Himself as love, and He shows us that He is totally united to us in our difficulties. Totally united with us. So we don't have to be afraid of anything. It's hard not to be afraid, but of course, He is with us even in our fear. He has given Himself and gives Himself as present in our lives now through Jesus and His Church.
In the end, we will be amazed when we realize what He has done for each of us. The marvelous truth will be clear: God is the Great Lover, He pours Himself out for each person, as only God can -- all the hidden ways will one day be manifest. He gives because He is the Giver, He is Gift.
Of course, a gift needs to be received, and love is only received in a fully personal way by the return of love. We have to say "yes" to God, through our life.
We are called to say yes to God, to say yes to the next step as God's light makes it clear to us, to say yes and to pray with trust that He will make it possible.