Your ideas matter
Possibly one of the best ways to show someone that they matter is to listen to what they have to say. As a child learns and discovers more and more about the world, they will usually talk about it to thier carers. As we listen to that child, we affirm them or we correct them. Those conversations play a big part in moulding them to become wholesome beings.
Throughout our lives, we will continue to grow, and the process of sharing ideas with those we regard will always play a part in helping us refine our thoughts to be more productive.
The onus is therefore on us to guard our ideas and bring them to the right sources who will listen, affirm, or correct us. Anyone who casts our ideas down as if they do not matter should be avoided, as they will have a crippling effect on our ability to improve.