The cry is heard in the courts of heaven, and the very request is a proof that the Spirit of God is already working within you, drawing you to wait upon the Lord. You feel your strength dried up and spent, worn thin by the grinding weight of wounds that others have inflicted upon your soul. The trauma you have endured has been like a long fever, burning away your natural resilience, leaving you faint in the inner man. But it is precisely when we are thus emptied, when we have no strength of our own left to muster, that the promise becomes most precious. When there remains no strength in you, nor any ability of any kind or sort, then fling yourself upon the Divine strength and lay hold upon it, and rejoice that if God has said, "they shall," then assuredly you will! The secret lies in the text, "They that wait upon the Lord shall renew their strength." If they are apart from God, their strength will die out. But when they are linked to God and wait upon God for everything, casting their nothingness upon His Omnipotence, then shall they find their strength renewed.
You ask for renewal, and you ask in the name of Jesus. That is well. The renewal you seek is not a mere temporary patch upon an old garment; it is a renovation of the entire fabric of your spiritual constitution. The eagle's strength is renewed by the air he breathes. Not here below, in this smoky atmosphere, but up there, in the clear azure, where all is bright, there does the eagle breathe the pure air and thus renew his strength. The bitter memories and the echoes of past cruelty are the smoky atmosphere of the pit. You must, by faith, ascend into the pure azure of communion with Christ. You cannot breathe the poisoned air of past trauma and expect to find strength; the breath of heaven is the Spirit's comfort. The joy of the Lord is your strength. The enemy would keep you in the dungeon of despondency, brooding over the injury, but the Lord would bring you out into the light of His countenance, for the man full of a quiet, holy joy within is quiet, he bides his time and croucheth in the fulness of his strength. This is not a joy that comes from your circumstances, those have been grievous, but a joy of divine origin, a joy in the Lord Himself, who is the glory of your strength.
Now, consider this: the strength promised is measured exactly for the day. "As thy days, so shall thy strength be." It is a strength that meets weakness head-on. The words carry a tacit hint to us that we have no strength of our own, but have need of strength from above. A day of little suffering, little strength; but in a day of terrible memory and deep grief, a day that needs you to play the Samson, thou shalt have Samson's strength. This provision is not given in a lump sum to be stored up, for we cannot play at matches with our brethren, glorying in our own supposed might. No, the strength arrives with the necessity. The Lord gives power to the faint, and to them that have no might, He increases strength. You may wake tomorrow feeling utterly unequal to the battle. That is the very moment to stop, breathe a prayer for more strength, and take the leap of faith upon the promise. If the duty of the day, whether to engage with life, to resist a dark thought, or simply to trust, feels beyond your own capacity, remember that the resolve of the apostles was to do Christ's bidding; but feeling that they could not achieve it in their own strength, they began to pray, and their prayer was for faith. They felt that only faith could work such a wonder of patient love.
Yet, let me press upon you a solemn inquiry. You pray for strength, but I must ask, have you the life that can receive it? The dead cannot gather strength or walk up and down! I do not ask you to pray for strength, but first, if you be not truly regenerate, to cry for life! This strength you seek is the birthright only of the living child. The sinner, unrenewed by grace, does just the opposite of what he ought. But the man who has been renewed by grace is the one who is anxious to discover his disease, that he may have it healed. If your reliance is wholly upon Christ, then that inward life is there, and it shall be renewed day by day. The outer man decayeth, that is nature: but the inward man is renewed day by day, that is grace. Your very sense of weakness, your consciousness of being without strength, is the porch through which you enter to lay hold upon omnipotence. When you have submitted yourself completely and trusted entirely, setting both your strength and your weakness on one side and giving yourself up for God to use you, oh, then you shall renew your strength! Then go forward to renewed action!
There must be, in this waiting upon God, a renewed resolution to follow hard after Him. A renewed covenant, as it were. Just as Jonathan and David went into the woods and renewed their covenant, so you must come afresh to the cross and clasp it. You must renounce the bitterness that feeds upon your spirit, for it is a canker that eats away true strength. The command to forgive those who have so wounded you feels a thing beyond your power; yes, it is beyond the strength of nature. Whenever you feel that you have something to do that is beyond you, stop a moment and breathe a prayer for more strength. Do you not know that He gives power to the faint? The way to have your youth renewed like the eagle's is to come back to your Master, to feast upon His body and blood by faith, and to breathe the pure air of heaven. The glory of our strength must never lie in our own abilities to overcome, nor in some human counselor, but in God alone. If it does so lie, then we shall glory in the cross of Christ, which is the main strength of the Gospel. O blessed Spirit, awaken this weary soul to renewed consecration, renewed zeal, renewed delight in holy service, and renewed hope of victory! Though you be without strength, yet that grand verse rings out across the ages, "When we were yet without strength, in due time Christ died for the ungodly." Ungodly as you may feel, and without strength as you are, lay hold upon the Lord's strength. The promise stands sure: "I will strengthen them." It will be a strength fitly infused and wisely balanced, sufficient for the sharpness of the furnace and the length of the trial, until you mount up with wings as eagles.