(Matthew 5:5)"Blessed are the meek, for they shall inherit the earth." (ESV)
The word blessed refers to a state of well being with God. The meek are those who are not self promoting and who do not assert themselves above others or even above God. Of course this is the exact opposite of what the world teaches us. But the wisdom of the world is found to be foolishness.
The meek trust in God who controls all things. The ultimate example of meekness is Jesus himself (Matthew 11:29, Matthew 21:5, 2 Corinthians 10:1). The background for this verse is Psalm 37:11.
(Psalm 37:11)"But the meek shall inherit the land and delight themselves in abundant peace." (ESV)