Now it came to pass in those days that He went out to the mountain to pray, and continued all night in prayer to God. -Luke 6:12

When no eye seeth you except the eye of God, when darkness covers you, when you are shut up from the observation of mortals, even then be ye like Jesus Christ. Remember His ardent piety, His secret devotion-how, after laboriously preaching the whole day, He stole away in the midnight shades to cry for help from His God. Recollect how His entire life was constantly sustained by fresh inspirations of the Holy Spirit, derived by prayer. Take care of your secret life; let it be such that you will not be ashamed to read at the last great day. Your inner life is written in the book of God, and it shall one day be open before you. If the entire life of some of you were known, it would be no life at all; it would be a death. Yea, even of some true Christians we may say it is scarce a life. It is a dragging on of an existence-one hasty prayer a day-one breathing, just enough to save their souls alive, but no more. O, my brethren, strive to be more like Jesus Christ. These are times when we want more secret prayer…

Ye who love God, of every place and every denomination, wrestle for your ministers; pray for them; for why should not God even now put out His Spirit? What is the reason why we are to be denied Pentecostal seasons? Why not this hour, as one mighty band, fall down before Him and entreat Him, for His Son’s sake, to revive His drooping church? Then would all men discern that we are verily the disciples of Christ.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0021.cfm