1 Corinthians 16:12

touching our brother Apollos See note on ch. 1 Corinthians 1:12. St Paul was anxious to have put Apollos, as a man of weight in the Corinthian Church, in charge of his letter. But Apollos steadfastly declined to go, fearing that his presence might foment, instead of allaying, the disorders. Titus and Apollos are found in close intercourse with each other and with St Paul many years later in Titus 3:13.

but his will was not at all to come at this time The original is even stronger, but it was not at all his will to come now.

when he shall have convenient time i.e. when he shall consider it a suitable time.