Kabbalah for Berakhot 20:44

Also one who is a person that loves peace and chases peace merits the attribute of ‘Tzadik’, as is known that the attribute of ‘Tzadik’ is called ‘Shalom’ (peace), and just like he separated peace he should ask for peace between a man and his wife and between a man and his friend. This is also explained by the verses of King David, “Who is the man who desires life and loves length of days that he may see good? Depart from evil and do good; Seek peace and pursue it” (Psalms 34:13-15). The aspect of “loves length of days that he may see good” is the correction of the attribute of ‘Tzadik’, and corresponding to it it says “depart from evil and do good; Seek peace and pursue it”, which is one who emits semen in vain, and “do good” is to correct the attribute of goodness by virtue of the Tzedakah, as is explained above. Also to adjoin ‘redemption’ with ‘prayer’ (not to have any break between ‘Ga’al Yisrael’ and the Amidah Prayer), as it says “and I have done that which is good in Your eyes” (Isaiah 38:3), that he adjoined ‘redemption’ with ‘prayer’. The meaning of “do good” is to correct the attribute of goodness that is called ‘Tzadik’ in the secret of unification, and therefore one needs to also seek after peace, as we explained, and this is the aspect of ‘doing’. The aspect of departing from evil that relates to the damage of the ‘Tzadik’ is guarding the tongue from anything that damages it, as we explained above regarding “guard your tongue from evil” (Psalms 34:14) that they defile those who damage their tongue, and there is no need to expand on this.