1 The LORD is my shepherd; I shall not want.
v1 The Lord is my Overseer, the shepherd of my soul (1 Pet 2:25)
As long as I obey he can provide all my needs. If I am disobedient as a sheep I end up in the cooking pot or eaten. Satan is a roaring lion seeking to devour disobedient sheep. (1 Pet 5:8)
2 He maketh me to lie down in green pastures: he leadeth me beside the still waters.
v2 He gives me peace from the troubles of the world around me (Satan's kingdom) and protects me from it if I let him. I must obey His commands to stay under His protection.
Ps 34:7 The angel of the LORD encampeth round about them that fear him, and delivereth them.
3 He restoreth my soul: he leadeth me in the paths of righteousness for his name's sake.
v3 He restores me (2 Cor 5:17). Note it is our soul and not our body He restores. He teaches us how to be in a proper relationship to people and Glorify Him because He is shown by our life to be a capable shepherd.
When a sheep is disobedient the flock suffers in some way so the unity He has in His flock brings Him praise and Glory and shows His work and caring love to the world around. The way His flock obeys demonstrates to the word His qualities as a shepherd.
4 Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me.
v4 The rod and staff are for correction and guidance and are not used to harm the sheep as each sheep is precious to the shepherd but are used to keep them safe and from harm. . If we we accept correcting and guidance from the shepherd He can protect us in danger and trials, You must trust the shepherd and accept His Guidance and Discipline
Ps 121:3 He will not suffer thy foot to be moved: he that keepeth thee will not slumber.
5 Thou preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over.
v5 He supplies us with all we need no matter what dangers He has to face to do this for us. He is the one who assesses the risks and works out how to provide for our needs (Mat 6:33)
He refreshes our spirit and soul and provides us with the Holy Spirit so we can obey and follow Him and serve Him. When we are with Him it does not matter what is around as we are overjoyed just to be with Him
Ps 16:11 Thou wilt shew me the path of life: in thy presence is fulness of joy; at thy right hand there are pleasures for evermore.
6 Surely goodness and mercy shall follow me all the days of my life: and I will dwell in the house of the LORD for ever.
v6 As I keep obeying and following Him I will be surrounded by His Goodness and Mercy and I will dwell in Its presence forever (Here on earth now and in eternity with Him after death).
Now I understand why He calls Himself the Good Shepherd
Jn 10:1-8 The Good Shepherd is Jesus
10:1-5 You can only be His sheep of you enter His flock the way He says too (Jn 14:6)
v9 In His flock you are saved
v11The God shepherd gives His life for His sheep.
v14 He knows His sheep and they know Him (to the excursion of all other v5 and will flee from them).
v15-18 The owner of the sheep is The Father and Jesus willingly lays down His life for the sheep out of Love for the Father. (Jn 17:12, 20)