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I.e., in and by itself, the force of evil epitomized in the concept of "Satan" has no power whatever: cf. 14:22 - "I had no power at all over you: I but called you - and you responded unto me. Hence, blame not me, but blame yourselves." (See also Razi's views quoted in my note [31] on the above-mentioned verse.) As regards the problem of God's "letting" or "allowing" a person to go astray (implied in the phrase "unless it be by God's leave"), see note [4] on 14:4 .
Evil can harm no one who is good, except in so far as (1) there is some question of trial in Allah's Universal Plan, or (2) what appears to be harm may be real good. Nothing happens without Allah's will and permission. And we must always trust Him, and not our cleverness or any adventitious circumstances that draw us the least bit from the path of rectitude.