Passage
a little leaven the whole lump doth leaven;
a little leaven the whole lump doth leaven;
Galatians 5:7 Ye were running well; who did hinder you--not to obey the truth?
Galatians 5:8 the obedience <FI>is<Fi> not of him who is calling you!
Galatians 5:9 a little leaven the whole lump doth leaven;
Galatians 5:10 I have confidence in regard to you in the Lord, that ye will be none otherwise minded; and he who is troubling you shall bear the judgment, whoever he may be.
Galatians 5:11 And I, brethren, if uncircumcision I yet preach, why yet am I persecuted? then hath the stumbling-block of the cross been done away;
The verse centers on "little", "leaven", "whole", "lump", and "doth". It is saying that the verse draws attention to "little" and "leaven", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 8's "the obedience FI is Fi not of..." into verse 10's "I have confidence in regard to you...", so "little" and "leaven" belong inside that flow. In Galatians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "little" and "leaven" with trust shaped by these words, not by a vague optimism outside the passage.