The greatest thing a Christian can do is to live each day at a time through the help of the Holy Spirit, trusting and following the Lord every step of the way.
Matthew 6:34 KJV Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.
Romans 8:14 KJV For as many as are led by the Spirit of God, they are the sons of God.
Proverbs 3:5-6 KJV Trust in the Lord with all thine heart; and lean not unto thine own understanding.  In all thy ways acknowledge him, and he shall direct thy paths.
Matthew 16:24 KJV Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me.