Midrasz do Psalmów 37:1

Further said R. Jochanan in the name of R. Simon b. Jochai: "It is permitted to quarrel with the wicked in this world, because it is said (Pr. 28, 4.) They that forsake the Torah praise the wicked, but those who observe the Torah contend with them." We also have a Baraitha to the same effect. R. Dostai b. Mathun says: "It is permitted to quarrel with the wicked in this world; as it is said (Pr. 28, 4.) They that forsake the Torah praise the wicked, but those who observe the Torah contend with them; and if some one should whisper to you saying: 'Behold! it is written (Ps. 37, 1.) Of David! Do not fret thyself because of the evil-doers.' Tell him that he whose heart smites him [who has no clear conscience] says so, for the real meaning of the passage is: Do not compete with the evil-doers, i.e., to be among evil-doers; And neither be thou envious against the workers of iniquity, to be like them. And it is also said (Pr. 23, 17.) Let not thy heart be envious against sinners, but in the fear of the Lord (remain) at all times." Is that so? Behold! R. Isaac said: "If you see a wicked man upon whom fortune smiles, do not quarrel with him, for it is said (Ps. 10, 5.) Prosperous are his ways at all times; and moreover, he always wins by law, as it is said (Ib.) Far aloof (remain) Thy punishments from him; and moreover, he sees [revenge] in his enemies, as it is said (Ib.) All his assailants, he puffeth at them." There is no difficulty [in understanding this]; one deals with secular affairs and the other deals with. divine affairs, and, if you wish, you may say both passages deal with divine affairs and there is no difficulty; for one deals with a wicked man upon whom fortune smiles, and the other with the wicked man upon whom fortune does not smile; and, if you wish, you may say both deal with a wicked man upon whom fortune smiles; yet there is no difficulty, for one deals with a perfectly righteous man and the other with one who is not righteous throughout; for R. Huna said: "What means the passage (Habakuk 1, 13.) Wherefore wilt thou look upon those that deal treacherously: be silent when the wicked swallows us him that is more righteous than he? How can it be possible that a wicked man should swallow up a righteous man? Behold! It is written (Ps. 37, 33.) The Lord will not leave him in his hand, and it is written (Pr. 12, 21.) No wrong can come unawares to the righteous! We must therefore say: "One, more righteous than he is, the wicked person does destroy, but he cannot destroy the perfectly righteous man." And, if you wish, you may say that when fortune smiles upon a man, it is different [and even one perfectly righteous should not fret at him].