Galatians 4:11 Meaning

9But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?

10Ye observe days, and months, and times, and years.

11I am afraid of you, lest I have bestowed upon you labour in vain.

12Brethren, I beseech you, be as I am; for I am as ye are: ye have not injured me at all.

13Ye know how through infirmity of the flesh I preached the gospel unto you at the first.