Faith in God, a simple and hard truth

I learnt today that having faith and trusting God is the simplest yet most difficult thing to do because it sounds too unbelievably simple for such a complex thing to be handed and put to God.

Example: in the way we live our life, complexity in the way we are faced with problems... Can I simply trust God, and believe that he will provide?

I guess the more simple we hope to be, the harder the challenge to simplify!