Comentario sobre Levítico 26:18

ואם עד אלה means AND IF, WHILE THESE ARE YET with you,לא תשמעו YOU WILL NOT HEARKEN,

לא תשמעו לי, "you do not listen to Me." Teshuvah is made conditional on "listening" to G'd, i.e. studying Torah. True repentance is impossible without Torah study.

שבע על חטאתיכם; meaning that you will be struck with many afflictions for your sins. The expression is similar to the use of the word שבע by Solomon in Proverbs 24,16 שבע יפול צדיק וקם, “the Just will fall seven times, (many times) and each time he will rise up again.” Compare also Isaiah using the word שבעתים, literally, “sevenfold,” to compare the light of the sun in the future. He means it will be immeasurably stronger than in the pre-messianic times. (Compare Isaiah 30,26) The same prophet also employs the word “seven” as meaning “many,” In Isaiah 4,1 when saying that many women will beg to be just allowed to use the name of a chosen man, asking not to be supported by him but just to be allowed to be known as belonging to that man.