Heirs of the Celestial Kingdom

Today I was thinking about what I wanted to study in the scriptures. I thought about our goals that are most important in an Eternal sense. We all want to make it to the Celestial Kingdom. I started reading in Doctrine and Covenants, Section 137:2-4

I saw the transcendant beauty of the gate that the heirs through which the heirs of that kingdom will enter, which was like unto circling flames of fire;
Also the blazing throne of God; whereon was seated the Father and the Son.
I saw the beautiful streets of that kingdom, which had the appearance of being paved with gold.

What a great promise for those who inheirit the Kingdom of God. But how do we make sure we are heirs of that kingdom? A couple of the answers are in 2 Nephi 9:18 We must:
Believe and stand as a witness
Be righteous
Endure the crosses of the world (foot note 18 C)

Also in Mosiah 27:26 (25-26) We must be 'Born Again' which is to say that we must be changed from a carnal state to a state of righteousness continually.

In conclusion, since we cannot comprehend the Eternal Life of the Celestial Kingdom, we can know that our trials will be a small price for the "greatest of all Gods gifts" (D&C 14:7)