This passage, Romans 15:1-7, comes as the conclusion to a long argument begun at the start of chapter 14, in which Paul considers how to treat those who, for one reason or another, are "weaker." (A better translation would be unable, in contrast those who are able). The passage is hard-hitting for the clear reason that we are not very gifted at support naturally; we need to submit ourselves to Christ's witness, sacrifice, and ministry in order to enable our own ministry.