Psalms 23:1
1The LORD is my shepherd; I shall lack nothing.
Wesley opens with the plain confession: the LORD is my shepherd; therefore I shall not want. The claim is personal—my shepherd—before any catalog of green pastures or still waters.
Grace enables a living trust that names the LORD as shepherd. Wantlessness is promised to those who so trust and stay under his care; the hearer must still appropriate the Shepherd and refuse rival stays that leave the soul empty.
Calvin: under the shepherd image David commends God’s providential care. God is shepherd only to those who feel their weakness and willingly abide in his sheepfold to be governed by him. Happiness consists in his hand stretched forth to govern us; those he has taken under his charge shall not want. We then honor him as Shepherd when we are persuaded that his providence alone is sufficient to supply all our necessities.
“My shepherd” is flock-membership under a governing providence—not a private motto hung on a self-kept life. Wantlessness rests on his charge of the sheep he keeps.
Key contrast Both confess that the LORD is shepherd and that those under his care shall not want. Arminian readers stress grace-enabled personal appropriation—my shepherd—as a trust the hearer must take up and keep. Reformed commentators stress that God shepherds those who surrender to his fold and that wantlessness grows from his providence over the flock he has taken under charge—not a promise floating free of that governance.