"My God, My God."
These words show the greatest faith that ever was in this world. Faith is believing the word of God, not becasue we see it to be true, or feel it to be true, but because God has said it. Now Christ was forsaken. He did not see that God was His God - He did not feel that God was His God; and yet He believed God's word and cried: "My God, my God."
David shows great faith in Psalm 42:7-8: "Deep calleth unto deep at the noise of Thy waterspouts: all Thy waves and Thy billows are gone over me. Yet the Lord will command His lovingkindness in the daytime, and in the nigh His song shall be with me, and my prayer unto the God of my life." He felt like one covered with a sea of troubles. He could see no light, no way of escape. Yet he believed the word of God, and said: "Yet the Lord will." This is faith - believing when we do not see.
Jonah showed great faith: "All Thy waves and Thy billows cast over me, then I said; I am cast out of Thy sight, yet will I look again toward Thy holy temple." (Jonah 2:3-4). He was literally at the bottom of the sea. He knew no way of escape - he saw no light - he felt no safety; yet he believed the word of God. This was great faith.
But, a greater than Jonah is here. Here is greater faith than David's - greater faith than Jonah's - greater faith than ever was in the world, before or after. Christ was beneath a deeper sea than that which covered Jonah. The tossing billows of God's anger raged over Him - He was in outer darkness - He was in hell; and yet He believed the word of God. He does not feel it - He does not see it - but He believes it and cries: "My God."
"Though He slay me yet will I trust in Him."
Dear believer, this is your surety. You are often unbelieving - distrustful of God; behold your surety - He never distrusted - cling to Him - you are complete in Him.