Parents should remember that association with those of lax morals and coarseness of character will have a detrimental influence upon the youth. If they fail to choose proper society for their children, if they allow them to associate with youth of questionable morals, they place them, or permit them to place themselves, in a school where lessons of depravity are taught and practiced. They may feel that their children are strong enough to withstand temptation; but how can they be sure of this? It is far easier to yield to evil influences than to resist them. Ere they are aware of it, their children may become imbued with the spirit of their associates and may be degraded or ruined. CT 120.1
Parents, guard the principles and habits of your children as the apple of the eye. Allow them to associate with no one with whose character you are not well acquainted. Permit them to form no intimacy until you are assured that it will do them no harm. Accustom your children to trust your judgment and experience. Teach them that you have clearer perception of character than they in their inexperience can have, and that your decisions must not be disregarded. CT 120.2