The meaning of "The Lord is my Shepherd; I shall not want" refers to the Lord as his personal Shepherd. In using this reference, David sees God as one who leads, guides and directs him. With this assurance in God’s protection, he concludes that his shepherd will also be there for him. As the tender shepherd, David had the full assurance that all his needs will be supplied and as a result he has placed His total dependence on God. In Isaiah 40:11, it also gives the reassurance of God’s constant care and protection of His children as it states “He shall feed his flock like a shepherd: he shall gather the lambs with his arm, and carry them in his bosom, and shall gently lead those that are with young.” God will always gently shepherd His children amidst the attacks that we encounter daily.