Philippians 2:20

‘For I have no man likeminded, who will care truly for your state.'

His reason for sending Timothy was because, of all whom he had available to him at that time, Timothy was the one whom he considered to be nearest to his own mind and soul (isopsuchos - ‘with the same soul', and therefore sharing his concerns), one who had the same caring heart as he had, and the ability to be a good watcher over their souls. He was the example of a true servant.

Note the play on words between ‘well in soul' (eupsuchos) in Philippians 2:19, and ‘like-souled' (iso-psuchos) here. Both were rare words expressing the very depths of their inner being.