"whoever is not against you is for you"
Luke 9: 50
Cast all your anxiety and do not worry. But this does not mean to do nothing. Anxiety can paralyze action, or can lead to the wrong action. Ecclesiastes 9: 18 "Wisdom is better than weapons of war."
But wisdom can come only with a clear mind that is not clouded by anxiety.
Instead of worrying that runny nosed kids might pass on to you the flu, just go get the flu shot and wash your hands. The shot is a bit of bad virus in you, but not enough to cause you the flu. Is indeed not against you but for you!
Interestingly here the message is exact the opposite than the one in Matthew 12: 30 "He who is not with me is against me." I like the message in Luke 9: 50 because it does not blame or bring prejudice on the Other.
We are we to blame the other just because is not like us? Why should the other be the enemy only because is not friend? Shouldn't we be merciful and accepting?
Trust in the other since if it is not your enemy will not do harm to you!