If I be not an apostle unto others, yet doubtless I am to you: for the seal of mine apostleship are ye in the Lord.
If I am not an apostle to others, yet doubtless I am to you. For you are the seal of my apostleship in the Lord.
If to others I am not an apostle, at least I am to you; for you are the seal of my apostleship in the Lord.
Even though I may not be an apostle to others, surely I am to you! For you are the seal; of my apostleship in the Lord.
Eve if I am not considered an apostle (a special messenger) by others, at least I am one to you; for you are the seal (the certificate, the living evidence) of my apostleship in the Lord [confirming and authenticating it].
Assuming that to others I am not an apostle, yet at least I am to you, for as for you all, you by virtue of your position in the Lord and your vital union with Him, are the seal which confirms and proves and authenticates my apostleship.
Even if other people should refuse to recognise my divine commission, yet to you at any rate I shall always be a true messenger, for you are a living proof of the Lord's call to me.
If I am not an apostle to other people, I certainly am one to you, for you yourselves, by virtue of your union with the Lord, are the proof of my apostleship.
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