What does it take for humans to be objectively agreeable and subjectively tolerant - minus egoism and skepticism?

I wanted to know what ideals do we think of and would like to implement into society that would not hinder us incapable of living amongst each other “peacefully”?

By peacefully I mean through perfect knowledge, and by perfect I mean ideal in your mind; and by knowledge I mean experiential, theoretical, and intrinsically good in itself; whereby, intrinsically good in itself I mean requires no external influence to be considered an end and with the possibility of this particular end also being alternatively a means.

I.e. Thinking (Philosophizing): It is intrinsically good because it gives humans the opportunity to communicate and organize knowledge and only requires the individual at hand to come to an end (although not always).

This question relates to wanting to understand what it takes for people to communicate effectively, respect subjective beliefs based on their virtue and not on their moral propagation or ideals.

Furthermore, in this particular forum I expect people to be considerate and clean in their terms and terminology. If you have nothing progressive to add, please do not participate.

Lastly, consider society in the past and how it is today and how much it has or hasn’t changed and what things in the past could be used today to further advance humanization ecologically.

I.e. Education. If people are more educated, perhaps they can understand more about each other in a psychological, philosophical, and sociological sense. If so, what should be done to promote this? There is too much to add to this so please improvise and do not be condescending. Again, you do not need to respond.