Expert vs Expertise

When you say you are an expert, it means you dominate the topic, you have worked days and nights, you have sweat for it, you had to shout and scream and laugh and cry for it, you felt like wanted to kill yourself but then you didn't and so here you are, an expert.

When you say you have expertise, it means you have touched a topic with soft hands, scared, not knowing what will happen. You have expertise if you know where to begin but no how is it going to end. You have expertise when you say you have done something for others once, a long time ago.

Please, it is necessary to have expertise to become an expert. Be sincere to those words.