Four ways of speaking to the saints

Now, brethren, if I come unto you speaking with tongues, what shall I profit you, except I shall speak to you either by revelation, or by knowledge, or by prophesying, or by teaching? 1 Corinthians 14: 6

By revelation.
By knowledge.
By prophesying.
By teaching.

This is the speaking to the saints that profits them : speaking BY these four.