He thus trades on your affection to blind you to your child's best interests by "worrying" about him.

For when worry besets you, is harassing you on every hand, how can you possibly devote your wisdom, your highest intelligence to safeguarding the welfare of the one you love.
Never was a slave in the South, though in the hands of a Legree, more to be pitied than the slave of worry.

He dogs every footstep, is vigilant every moment.

He never sleeps, never tires, never relaxes, never releases his hold so long as it is possible for him to retain it.

When you seek to awaken people to the terror, the danger, the hourly harm their slavery to worry is bringing to them, they are so completely in worry's power that they weakly respond: "But I can't help it." And they verily believe they can't; that their bondage is a natural thing; a state "ordained from the foundation of the world," altogether ignoring the frightful reflection such a belief is upon the goodness of God and his fatherly care for his children.