Doctrine and Covenants 11:11-13

11 For, behold, it is I that speak; behold, I am the alight which shineth in darkness, and by my power I give these words unto thee.
12 And now, verily, verily, I say unto thee, put your trust in that Spirit which leadeth to do good—yea, to do justly, to walk humbly, to judge righteously; and this is my Spirit.
13 Verily, verily, I say unto you, I will impart unto you of my Spirit, which shall enlighten your mind, which shall fill your soul with joy;