(24) The LORD bless you and protect you! (25) The LORD deal kindly and graciously with you! ֿ
(26) The LORD bestow His favor upon you and grant you peace!
(27) Thus they shall link My name with the people of Israel, and I will bless them.
And they shall put my name upon the children of Israel and I will bless them
i.e. they shall bless them by the Proper Name of God (i. e. when uttering the blessings they shall use the Tetragrammaton and no substitute for it) (Sifrei Bamidbar 43).
Baal Shem Tov teaching on יהוה
Rabbi Jonathan Sacks:
"Protection, grace, peace: these are God's blessings, communicated by the priests. We are what we pray for. If you seek to understand a people, look at its prayers. The Jewish people did not ask for wealth or power. They did not hunger after empire. They had no desire to conquer or convert the world. They asked for protection, the right to live true to themselves without fear; for grace, the ability to be an agent for good in others; and peace, that fullness of being in which each of us brings our individual gifts to the common good. That is all our ancestors prayed for, and it is still all we need."
From "The Priestly Blessings: Protection, Grace, and Peace"
Rabbi Nehemiah Polen:
The S'fat Emet has a mystical view of the Priestly Blessing. He does not emphasize the uniqueness of the lineage of the Aaronide priesthood. We are all priests, working to cultivate the sublime spirit, the inner point, הנקודה הפנימית. "Reaching for the נקודה פנימית is what today is often called a spiritual practice." Shalom is the inner vitality that provides fulfillment and life. The S'fat Emet links inwardness to "shalom in a way that makes the Priestly Blessing a call to all-inclusiveness, an invitation to appreciate the soaring range and interconnectedness of all being."
From " Birkat Kohanim in the S'fat Emet"