God blesses the pure in heart: Just as the fat of the sacred offerings is set apart, so DAVID was chosen out of all Israel. Ben Sira 47:2

The spiritual teacher Ben Sira intended to teach in his sapiential book how the eternal wisdom of God manifested with intelligence to men, wisdom does not consist only of nice phrases to live by as the pagan and ignorant people claimed; and thus he described and praised the most outstanding men in the history of Israel to demonstrate that wisdom is something practical and necessary to achieve success and beatitude.
And that is why he mentioned a very special person, King David. The story of David and how he ascended to the throne of the nation of Israel is told in the First Book of Samuel, and this story is a teaching of how God blesses the pure in heart, those who fear him with the heart. The wise Ben Sira began to teach about the life of David with these words: "Just as the fat of the sacred offerings is set apart, so DAVID was chosen out of all Israel" Ben Sira 47:2.
In simpler words, Ben Sira said that David was separated from his brothers as the sacred is separated from the mundane. David had been chosen by God to fulfill a providential mission, succeed King Saul, and lead the Kingdom of Israel towards its time of greatest splendor to thus fulfill all the divine blessings, blessings promised since the time of the prophet Abraham. The wisdom from above was personified in David, wisdom became the "daughter of man", and she gave her wonderful fruits, prosperity, happiness, peace, and the safe life. Because with wisdom, there is more than good judgment, there is good discernment and the ability to make accurate decisions not only in the short term but also in the long term. It is for all this that God ultimately blesses, because this is what pleases God, and what fits with the ethical laws of the universe.

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