Musar על ברכות 107:19

Chapter 5 - How a person can accustom himself with the trait of kindness (chesed): [Its] essence is love of God - the main entrance for a person to the secret of kindness is to love God with the fullest love, such that he will not leave His service for any reason. [This is] on account of there being nothing at all as beloved to him, relative to his love of Him, may He be blessed. And so, he [should] first fix all the needs of His service; and what remains afterwards will be for other needs. And this love [should] be fixed in his heart. Whether he receives goodnesses from the Holy One, blessed be He, or whether he receives afflictions and upbraidings, he [should] consider them [to be products of His] love for him, as it is written (Proverbs 27:6), "Faithful are the wounds of a friend." And it is as it is [also] written (Deuteronomy 6:5), "and with all your might (meodecah)" - and they explained (Berakhot 54a), "With each and every trait (midah), etc., so as to include all of the traits in Kindness. And it comes out that the secret of His governance is from Kingship (Malkhut); and even as it acts with judgement, it is connected to Kindness. And this is the trait of Nachum, the man of Gamzo, who would say, "This too (Gam zo) is for the good." He wanted to always connect [occurrences] to the side of Kindness that is called good, and [so] he would say, "This too," that appears to be with the 'left' that is connected to Severity (Gevurah), "is" nothing but "for the good," [which is] connected to Kindness. And he would put his mind to the side of the good with this trait and hide its judgments. And this is a great practice, always to connect with Kindness.