feed = shepherd: i.e. instruct. Illustrations: Job (Pro_4:3, Pro_4:4; Pro_29:21, Pro_29:22); David (Psa_78:70-72); Peter (Act_4:1-4); Philip (Act_8:5-8); Paul and Barnabas (Act_11:26; Act_14:22-28); Judas and Silas (Act_15:32, Act_15:33).
for = through.
wisdom: Hebrew "heart", put by Figure of speech Metonymy (of Subject), App-6, for understanding.