I know not if I will ~
What does it mean? What is I know not if I ~?
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"I know not ~" is an alternative form of "I don't know ~". Thus, "I know not if I will embrace those tomorrows" is simply "I don't know if I will embrace those tomorrows".
Another sentence with a similar structure (but with much simpler subject matter):
I don't know if I will eat the cake nor if I will enjoy the cake, yet the chocolate frosting looks delicious.