To the one who is tempted to give up on God:
The Lord calls to you in His word. He stretches His arm to you to rescue you. Even though you lack faith and you believe He is just not going to hear you or respond to you, He reaches out to you anyway. He is not offended by your doubts. He understands your doubts.
Elijah was given to doubt and was a man with a nature no different than yours. If you stood up today in your doubts and loudly yelled out to the people around you, "God is faithful!” they might not believe you. They might look at you and size you up as someone who has no right to say such a thing since you are suffering from such deep doubts. You might even agree with them about yourself; you might say of yourself, "I am God’s worst representative”. Elijah had given up on God and wanted to die. Yet, it was Elijah’s God-given prophetic voice that God chose as the spirit and example of the announcement of the arrival of His kingdom.
There’s something that God has placed in you, brother doubter, that God wants to use for the glory of His Kingdom. Just as God chose John the Baptist (Luke 1:17) to fulfill that function as the one in the voice and spirit of Elijah (Malachi 4:5) to prepare a people for the kingdom’s arrival, a herald of that kingdom, God has chosen you for His own glory and His own purposes. Revelation 4:11, Acts 17:26. Down to the time and place of your life, He has ordained you. And, He has ordained you to be conformed to the image of Jesus, who suffered and learned obedience through His suffering.
John the Baptist doubted, asking "Are you Him, or do we look for another?” Jesus told John’s disciples, "You go tell him” all the works Jesus was doing. Jesus words and works testified to God’s anointing of Jesus, God the Son, as the Messiah. His words and works testify to your choice by Him "in the beloved”, as one who has believed on the testimony of the apostles by the word of those whom God sent with the good news of Jesus Christ. You know He is the One.
And, to them that believed, he gave the power/right to become the sons of God. John 1:12. You are empowered and filled with the Spirit who raised Jesus from the dead. And, even in your doubts, God stands ready to assure you although you may struggle for some time to understand and be comforted by Him.
Isaiah 40:27-31 says,
Why do you say, O Jacob,
and speak, O Israel,
"My way is hidden from the LORD,
and my right is disregarded by my God”?
28 Have you not known? Have you not heard?
The LORD is the everlasting God,
the Creator of the ends of the earth.
He does not faint or grow weary;
his understanding is unsearchable.
29 He gives power to the faint,
and to him who has no might he increases strength.
30 Even youths shall faint and be weary,
and young men shall fall exhausted;
31 but they who wait for the LORD shall renew their strength;
they shall mount up with wings like eagles;
they shall run and not be weary;
they shall walk and not faint.
Your ways are not hidden from the Lord, and your right and power to become like Jesus is not disregarded. He knows you and He knows your doubts and He still stands ready and present pouring Himself to you. He does not faint, does not grow weary, and His understanding of you is insearchable. He gives power to … the faint. He gives strength to … the weak. He causes you to be able to soar with Him in His strength, His endurance.