וְאָמַ֨רְתִּֽי אֲנִ֜י בְּלִבִּ֗י כְּמִקְרֵ֤ה הַכְּסִיל֙ גַּם־אֲנִ֣י יִקְרֵ֔נִי וְלָ֧מָּה חָכַ֛מְתִּי אֲנִ֖י אָ֣ז יוֹתֵ֑ר וְדִבַּ֣רְתִּי בְלִבִּ֔י שֶׁגַּם־זֶ֖ה הָֽבֶל׃
Entonces dije yo en mi corazón: Como sucederá al necio me sucederá también á mí: ¿para qué pues he trabajado hasta ahora por hacerme más sabio? Y dije en mi corazón, que también esto era vanidad.
Rashbam
אשר תקראו אותם מקראי קודש, which you are to designate as periods of sanctified time. Whenever the word קרא appears in connection with the festivals it means the fixing of certain dates in the calendar. We have an example of this in Lamentation 1,15 where the prophet Jeremiah refers to the date on which the Temple was destroyed as קרא עלי מועד,”G’d having fixed the date the Jewish people was to experience this traumatic event including the killing of the flower of its youth.” Yonathan ben Uzziel, in translating Kohelet 2,15 כםקרה הכסיל, normally translated as “like the fate of the fool,” renders these words as מערע קדיש, [my version of the Targum renders the meaning of the verse quite differently, in a fatalistic sense, i.e. that G’d decrees death regardless of whether one is a fool or as wise as Solomon. Ed.]