I have been recommended a lot of times to read the classic texts. But I find them usually quite algorithmic and less thought provoking. It feels like they give way more importance to rigor than the proper understanding of the topic. Rigor is surely important I know but that should come after the understanding of the topic (like in the best modern day books). Also many methods feel like obsolete. So, what is your suggestion on the best way to utilize classic texts. Also, when learning some new math theory should the classics come first in preference of reading or should they be left for more rigorous understanding later on. I don't mean that classic texts are not at all useful. I think they provide a nice insight on how the theory developed (which is important to get the real significance of the subject) but I am asking about their validity as serious learning resources in modern day.
Note: When I say classic, I mean the ones like Hall and Knight, G H Hardy, SL Loney, etc. The ones like Euclid are some other category which I think is surely not for a first read and may be not even necessary, but highly recommended to be read to get a feel of the topic.