Excellence means to excel in the things you do regularly. This can refer to skills you use at work, in your hobbies, or in anything else that matters to you. Furthermore, it doesn’t just mean excelling per se, it means working to excel. The more you work towards improving your skills, the stronger this pillar will become.
Confidence comes in many different forms, and some of them are temporary while others are longer-lasting or permanent. When you work to build your confidence, you want to concentrate on building up the latter kind.