They are all plain to him that understandeth. The man who listens to and imbibes the teaching of Wisdom finds these words intelligible, and "to the point." Opening his heart to receive Divine instruction, he is rewarded by having his understanding enlightened; for while "the natural man receiveth not the things of the Spirit of God" (1 Corinthians 2:14), yet "the secret of the Lord is with them that fear him" (Psalms 25:14), and "mysteries are revealed unto the meek" (Ecclesiastes 3:19, Complutensian *).
Right to them that find knowledge (Proverbs 8:10). They form an even path without stumbling blocks for those who have learned to discern right from wrong, and are seeking to direct their lives in accordance with high motives.
Septuagint, "They are all present ( ἐνώπια) to those that understand, and right ( ὀρθὰ) to those that find knowledge."