多说一嘴，《论语》其实是很散的对话的集合，人为分篇章部分。
每一篇的开头的话作为标记，《为政》是《论语》第二个部分，这一部分开头是
子曰：“为政以德，譬如北辰，居其所而众星共之。”

“吾十有五而志于学”这一句是《论语·为政》的第四个对话。

 the present investigation sought to provide a review of 
both widely recognized and some lesser-known individual difference 
dimensions, spanning cognitive abilities and personality traits, and to 
chart their age-related trajectories using a common metric to enable 
direct comparisons. Additionally, weighted composites of these di
mensions were developed and plotted across the adult lifespan to esti
mate the age at which humans reach their peak in overall cognitive- 
personality functioning. It was hypothesized that although fluid intel
ligence peaks relatively early, the integration of other relevant di
mensions would reveal a composite peak occurring later in adulthood.
 Next, we outline the conceptual framework that guided the selection 
of candidate dimensions for inclusion in the weighted composite index. 
This is followed by detailed sections defining each individual difference 
dimension retained for analysis, reviewing their relevance to important 
life outcomes, and summarizing evidence on their age-related trajec
tories across adulthood. Finally, we conclude with a dedicated section 
that describes several theoretically relevant but ultimately excluded 
dimensions, along with the rationale for their omission.