"these mountains we often bowed together in worship and supplication. All around me were the places which had been thus hallowed; and as I gazed upon them, I could recall many instances in which we there received direct and remarkable answers to prayer.... LS 256.1"
"But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly."
Both passages emphasize the importance of private prayer and the idea that God hears and answers prayers offered in secret. The EGW passage provides a personal example of this principle in action.
"“How near we seemed to God, as in the clear moonlight we bowed upon some lonely mountain side to ask for needed blessings at His hand! What faith and confidence were ours! God's purposes of love and mercy seemed more fully revealed, and we felt the assurance that our sins and errors were pardoned. Upon such occasions I have seen my husband's countenance lighted up with a radiance that seemed reflected from the throne of God, as in changed voice he praised the Lord for the rich blessings of His grace. Amid earth's gloom and darkness, we could still discern on every hand gleams of brightness from the Fount of light. Through the works of creation we communed with Him who inhabiteth eternity. As we looked upon the towering rocks, the lofty mountains, we exclaimed, ‘Who is so great a God as our God?’ LS 256.2"
"One thing have I desired of the Lord, that will I seek after; that I may dwell in the house of the Lord all the days of my life, to behold the beauty of the Lord, and to enquire in his temple."
Both passages express a deep desire to be close to God and to experience His presence. The Psalm speaks of dwelling in the house of the Lord to behold His beauty, while the EGW passage describes feeling near to God while praying in nature.