@pleonasm - There just needs to be a balance between the two. Love and discipline are both very important to young people and any good childcare training will help to develop both of these aspects of your practice.
It is important not to neglect either of them though. I've worked with kids who never experienced any kind of structure when they were young and were suddenly expected to sit still for long periods during school hours and do whatever the teacher told them to do.
That just doesn't come naturally to a child who has never experienced it before. And it does become a safety issue when they think they can run off in the middle of class.
But, at the same time, you want all children to feel supported and understood. If they aren't having fun with you then you're doing it wrong.