They are all plain to him that understandeth, and right to them that find knowledge. They are all plain - נכחים nechochim, straight forward, over against every man, level to every capacity. This is true of all that concerns the salvation of the soul.
To them that find knowledge - When a man gets the knowledge of himself, then he sees all the threatenings of God to be right. When he obtains the knowledge of God in Christ, then he finds that all the promises of God are right - yea and amen.