Isaiah 55:10 and 11
For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater:

So shall my word be that goeth forth out of my mouth:  it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.

Playing in the rain can be even more fun when it reminds us
that God's Word accomplishes what He sends it to do.