Chapter 1: Divine Truth, B: All Divine Truth is Posessed by God and Imparted by Him to HIs Children

God is omnipotent. He knows everything there is to know, and there isn't anything he doesn't know. If he doesn't know it, it doesn't exist. This is important for us to know so that we can have faith in God's teachings and commandments.

But all things are done in the wisdom of him who knoweth all things.
2 Nephi 2:24

O how great the holiness of God! For he knoweth all things and there is not anything save he knows it.
2 Nephi 9:20

The Father, Son and Holy Ghost, as one God, are the fountain of truth.
Smith, Gospel Doctrine, 30

God is the source of all of our knowledge. Everything that anybody knows comes from God. God wants us to learn and grow and so he gives us knowledge as we can receive it.

And the light which shineth, which giveth you light, is through him who enlightenenth your eyes, which is the same light that quickeneth you understandings; Which light proceedeth forth from the presence of God to fill the immensity of space--The light which is in all things, which giveth life to all things. which is the law by which all things are goverened, even the power of God who sitteth upon his throne, who is in the bosom of eternity, who is in the midst of all things.
D&C 88:11-15

Our Father, the great God, is the author of the sciences, he is the great mechanic, he is the systematizer of all things, he plans and devises all things, and every particle of knowledge which man has in his possession is the gift of God.
Brigham Young, Discourses of Brigham Young, 2-3

God want us to gain all kinds of knowledge. This is why we are not just encouraged to learn about the scriptures, but also in all areas of education.

What is this knowledge, intelligence, and light and truth that our Heavently Father would have us receive?... Secular knowledge can be most helpful to the children of our Father in Heaven, who, having placed first things first, have found and are living those thruths which lead one to eternal life. These are they who have the balance and perpective to seek all knowledge--revealed and secular--as a tool and servant for the blessing of themselves and others.
Spencer W. Kimball, "Seek Learning, Even by Study and Also by Faith," Ensign, Sept. 1983, 3

God teaches us truth through the Holy Ghost. The Holy Ghost is God's messenger of truth.

Therefore whoso readeth it, let him understand, for the Spirit manifesteth truth; and whoso is enlightened by the Spirit shall obtain benefit therefrom.
D&C 91:4

The Spirit of truth is of God, I am the Spirit of truth, and John bore record of me, saying: He received a fulness of truth, yea, even of all truth.
D&C 93:24