Therefore do not be ashamed of the testimony about our Lord, nor of me his prisoner, but share in suffering for the gospel by the power of God, who saved us and called us to a holy calling, not because of our works but because of his own purpose and grace, which he gave us in Christ Jesus before the ages began, and which now has been manifested through the appearing of our Savior Christ Jesus, who abolished death and brought life and immortality to light through the gospel, for which I was appointed a preacher and apostle and teacher, which is why I suffer as I do. But I am not ashamed, for I know whom I have believed, and I am convinced that he is able to guard until that Day what has been entrusted to me. Follow the pattern of the sound words that you have heard from me, in the faith and love that are in Christ Jesus. By the Holy Spirit who dwells within us, guard the good deposit entrusted to you.
(2 Timothy 1:6-14 ESV)
“We are not living on ourselves. We must not think of ourselves as ordinary people. We are not natural men; we are born again. God has given His Holy Spirit, and He is the spirit ‘of power and of love and of a sound mind.’ Therefore to those who are particularly prone to spiritual depression through timorous fear of the future, I say in the Name of God and in the words of the Apostle: ‘Stir up the gift’, talk to yourself, remind yourself of what is true of you. Instead of allowing the future and thoughts of it grip you, talk to yourself, remind yourself of who you are and what you are, and of what Spirit is within you; and, having reminded yourself of the character of the Spirit, you will be able to go steadily forward, fearing nothing, living in the present, ready for the future, with one desire only, to glorify Him who gave His all for you” (Martyn Lloyd-Jones, Spiritual Depression: Its Causes and Its Cure, 105).