Explanation:

Albert Einstein, one of the most renowned physicists of all time, was known for his unique approach to education. He had a rebellious nature and often clashed with the traditional education system. As a result, he was not satisfied with the rigid structure and limited scope of what was being taught in school. This dissatisfaction led him to contemplate leaving school and pursuing his own path to learning.

Joyous:
Einstein's decision to leave school was not driven by fear or doubt, but rather by a sense of joy and excitement. He saw leaving school as an opportunity to explore his own interests and passions, free from the constraints of a formal education. For Einstein, the prospect of forging his own path was exhilarating and liberating.

Evidence:
There are several pieces of evidence that support the idea that Einstein was joyous with his decision to leave school. Firstly, he once remarked, "Education is what remains after one has forgotten what one has learned in school." This statement reflects his belief that true education goes beyond the confines of a classroom and that learning should be a lifelong pursuit. Additionally, Einstein was known for his insatiable curiosity and thirst for knowledge. Leaving school allowed him to cultivate this curiosity and explore subjects that interested him on a deeper level.

Self-Confidence:
Another reason why Einstein may have been joyous with his decision to leave school is his self-confidence. Einstein had a deep belief in his own abilities and was not afraid to challenge the status quo. He had a strong sense of self and a clear vision of what he wanted to achieve. By leaving school, he was able to take control of his own education and pursue his own intellectual interests.

Conclusion:
In conclusion, Einstein's decision to leave school was driven by a sense of joy and excitement. He saw it as an opportunity to explore his own interests and passions, free from the constraints of a formal education. His self-confidence and belief in his own abilities contributed to his joyous attitude towards leaving school.