Man is not promised an endless supply of strength for him to store up. Rather, God promises to provide the necessary grace and strength for the present trials.
Like other callings upon a person’s life, God prepares men and women for marriage. Obviously, God prepares the heart, but He also prepares other areas in order to provide for a strong home. When God created Adam, He could have immediately created Eve, but He chose to allow Adam to experience the sense of being alone. Perhaps there are other reasons, but God may have thought it wise to prepare Adam for marriage. He needed to experience life without Eve. Adam needed to come to the place where he desired companionship. He needed to be alone before he could truly appreciate a wife. In addition to the preparation of Adam’s heart, the Lord gave him a job, a means by which he could provide for Eve (Genesis 2:8-9, 15). All of these preparations were necessary for a strong marriage relationship.