First of all, the phrase "the world is not careful about my sister" may imply that the world is contemptuous and sloppy about women (my sister). It may express the phenomenon that women are neglected or treated unfairly in society.
Then, the phrase "pro-heaven is not pro-world", literally speaking, may describe someone who refuses the prosperity, disturbance and love of the world and pursues spiritual satisfaction and pursuit instead. But combined with the above, it may also suggest that women may choose to give up their dependence on the world and seek self-satisfaction and spiritual satisfaction when facing social and emotional pressure.
Generally speaking, these two sentences seem to express a satire on secular ideas and sympathy for female roles. Please note, however, that this is only based on the direct understanding of a given sentence, and the specific meaning may vary according to the context, context and user's intention.