Book of Hosea Chapter 12 Vs. 10

 The Lord's Indictment of Israel and Judah

I have also spoken by the prophets, and I have multiplied visions, and used similitudes, by the ministry of the prophets. Hos. 12:10

by the prophets, ... Three ways that God has spoken:

1. By the prophets (Heb. 1:1)

2. By visions (Gen. 46:2; Eze. 1:1-28)

3. By similitudes

I have also... Here is an aggravation of their guilt, that it was not through ignorance that they sinned, but in defiance of God’s revealed Word.

The prophets did not speak their own words. They spoke the words God put into their mouths. God had given visions to warn them as well. The similitudes in the ministry of the prophets were things like Isaiah walking naked and barefoot in the street. The prophet was showing in the physical, the spiritual condition of the people.

by the ministry... Another very good example of that was Jeremiah wearing the yoke around his neck, when he ministered. The similitudes could be also speaking of the parables of things, like the vineyard that were given. God had used everything within His power to reach them, before it was too late.

And I spake to the prophets: it was I who multiplied vision, and by the hand of the prophets gave parables.

Though the Lord had communicated His will to Israel through the prophets, the people had repudiated those messages (cf. Hos. 9:7 and Hos. 11:2).