You'll not be shaken

because [he is] at my right hand:
to counsel and instruct, to help, protect, and defend: the phrase is expressive of the nearness of God to Christ, his presence with him, and readiness to assist and stand by him against all his enemies; see ( Psalms 109:31 ) ( 110:5 ) ( 121:5 ) ; so the Targum paraphrases it, "because his Shechinah rests upon me";

I shall not be moved:
as he was not from his place and nation, from the duty of his office, and the execution of it, by all the threats and menaces of men; nor from the fear, worship, and service of God, by all the temptations of Satan; nor from the cause of his people he had espoused, by all the terrors of death, the flaming sword of justice, and the wrath of God; but, in the midst and view of all, stood unshaken and unmoved; see ( Isaiah 42:4 ) ( 50:5-9 ) .

Source: biblestudytools.com