I like the hymn #26: Joseph's Smith's First Prayer:

"Oh, how love-ly was the morn-ning! Ra-diant beamed the sun a-bove. Bees were hum-ming, sweet birds sing-ing, Mu-sic ring-ing thru the grove, When with-in the shad-y wood-land Jo-seph sought the God of love, When with-in the shad-y wood-land Jo-seph sought the God of love.

Hum-bly kneel-ing, sweet ap-pealing - 'Twas the boys's first ut-tered prayer - When the pow'rs of sin as-sail-ing Filled his soul with deep des-spair; But un-daunted, still he trust-ed In his Heav'n-ly Fa-ther's care, But undaun-ted, still he trust-ed In his Heav'n-ly Fa-ther's care.

Sud-den-ly a light de-scended, Bright-er far than noon-day sun, And a shin-ning, glorious pil-lar O'er him fell, a-round him shone, While ap-peared two heav'n-ly be-ings, God the Fa-ther and the Son, While ap-peared two heav'n-ly be-ings, God the Fa-ther and the Son.

"Jo-seph, this is my Be-lov-ed; Hear him!" Oh, how sweet the word! Jo-seph's hum-ble prayer was an-swered, And he lis-tened to the Lord. Oh, what rap-ture filled his bo-som, For he saw the liv-ing God, Oh, what rap-ture filled his bos-om, For he saw the liv-ing God."

I love this hymn. I know that Joseph Smith was a prophet of God, and that he saw God  the Father and His son, Jesus Christ in the sacred grove.