What are the three most significant beliefs/statements Lincoln expressed in the address?

beliefs-

a quote that exemplifies each main belief-

The three most significant beliefs / statements Lincoln expressed in the address are:

all men are created equal.

We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live.

that government of the people, by the people, for the people, shall not perish from the earth.

Explanation:

The reasons behind this answer are the following: First of all, Lincoln argues that the founding fathers fought to bring equality to all men. Because they were abused by Great Britain's crown for far too long. Also that the fighters of the civil war had to dedicate a portion of the field to honor the ones who died for the nation to live. Appreciating their effort. Finally, he said that the government is ruled by the people and they have the ultimate power.