'Tends' in the Bible

Now as to things which have been sacrificed to idols. This is a subject which we already understand--because we all have knowledge of it. Knowledge, however, tends to make people conceited; it is love that builds us up.

What soldier ever serves at his own cost? Who plants a vineyard and yet does not eat any of the grapes? Or who tends a herd of cattle and yet does not taste their milk?