"Do not boast about tomorrow, for you do not know what a day may bring." (Proverbs 27:1)
Do not boast about tomorrow, for you do not know what a day may bring. Let someone else praise you, and not your own mouth; an outsider, and not your own lips. Stone is heavy and sand a burden, but a fool's provocation is heavier than both. Anger is cruel and fury overwhelming, but who can stand before jealousy? Better is open rebuke than hidden love. Wounds from a friend can be trusted, but an enemy multiplies kisses. The full soul loathes honey from the comb, but to the hungry even what is bitter tastes sweet. Iron sharpens iron, and one person sharpens another. As water reflects the face, so one's life reflects the heart. Know well the condition of your flocks, give careful attention to your herds.
The Catechism identifies the humility that does not boast of tomorrow as the virtue of those who know their lives are in God's hands - the opposite of the presumption that makes plans without reference to divine providence (CCC 2092).
Brothers and sisters, iron sharpens iron and one person sharpens another. The person who avoids honest friends and seeks only affirmation remains dull. The wounds from a friend who tells the truth sharpen you for the work God has given. Seek friends who will sharpen you rather than merely stroke you. And be willing to be the iron that sharpens.
Lord God, give us friends who sharpen us and give us the courage to sharpen our friends. Through Christ our Lord. Amen.