The Pure in heart shall see God, those that hunger and thirst after righteousness shall be completely satisfied with the same, the peace-makers shall be called the sons of God. These second clauses in the beatitudes describe the essence of the final kingdom in which the reward will consist. They show, therefore, that the reward towards which Jesus points his followers is not something morally or spiritually indifferent, but the highest enjoyment of what here already constitutes the natural blessedness pertaining to the internal Kingdom. Thus the reward bears an organic relation to the conduct it is intended to crown.
– Geerhardus Vos
1862 – 1949