But don't confuse "child like" with "childish".  We need to be child-like.

God absolutely wants us to develop every capability He gave us, so that we can love Him by solving problems for His children (cancer, engineering problems, etc.).

But He knows that pride can get the better of us...all the time, in sneaky ways.

Pride distances us from God.

Humility is the virtue that "opposes" pride.   So we must be  practice our humility daily and one way to do that is to relfect on the fact that we can't do anything..anything..with grace from God.  We are totally dependent, as a child is, on the love of parents.

People who know about the "interior life" know the value of "spiritual childhood".

Escriva said: "Being children you will have no cares: children quickly forget what troubles them and return to their games. With abandonment, therefore, you will not have to worry, since you will rest in the Father. "