胡 * * * * 指出，党的先进性和党的执政地位都不是一劳永逸、一成不变的，过去先进不等于现在先进，现在先进不等于永远先进；过去拥有不等于现在拥有，现在拥有不等于永远拥有。胡 * * * * 还指出，不动摇、不懈怠、不折腾，坚定不移地推进改革开放，坚定不移地走中国特色社会主义道路。阅读材料回答：
（1）请你回答发展的实质是什么？
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（2）请运用发展观的知识分析回答：为什么说“党的先进性和党的执政地位都不是一劳永逸、一成不变的”？
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（3）请运用生活与哲学的知识分析回答：坚持改革开放“不动摇、不懈怠、不折腾”的哲学依据。
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