I think this is something I have been learning over time just from experience.
Sometimes I tried so hard to prove a point and it would just falls on deaf ears or actually cause the other person to put their defenses up and be less receptive. It is a lot like banging your head against a brick wall, it doesn't really achieve anything and you end up with a headache.
Better to just live well and lead by example. Those that want to learn will notice.