“Deserving is he who enters and exists [and enters]” etc. This is the passage quoted in the Zohar III 292a.

The idea here is that there are two levels: going up and going down. We all experience these ups and downs during the times of our lives. However, the concept is known as yerida letzorech aliya,we descend in order to ascend. When we hit rock bottom, when we feel like we are at the bottom of the pit when we can’t get any lower, that’s when we have to remember that the Zohar is saying he enters leaves and enters again.

This is Pesach where Hashem skipped over all the doorways, Chazal teaches that Hashem says open me a small opening like the eye of a needle and I will open it for you like a vast hall”

And, for me the most important thing to recognize is that when the winter ends, and spring comes, what comes out in spring attests to what was working on deeper levels back when everything seemed lifeless and hopeless in the heart of winter.