Consistent compliance with Wikipedia policy is more important than your personal beliefs. Inconsistent compliance is a good sign of activist editing.
For example, if you assert something, and are presented with countering evidence from a reliable source, do you consider changing your position like a reasonable editor, or do you ignore it to argue your position?
When you join a wiki community, be a constructive editor.
The "perfect" Wikipedia article is built on solid research (remember to cite your sources). Contrary to popular belief, not all information is available for free on the Internet. Some research is only published in scientific journals and books (ask your library for remote lending services); some material is available only in commercial, password-protected electronic databases. If you have access to useful research material, please add the relevant information to Wikipedia:WikiProject Resource Exchange, a central portal to find Wikipedians with access to such resources. Remember we can only use facts from sources such as these, not a particular copyrighted expression thereof.
If you are a qualified user you can request access to the databases of paywalled resources proctored by The Wikipedia Library. Qualification usually involves having 500–1000 main namespace edits and 6–12 months tenure editing on Wikipedia.