it = It is important to take a vacation when I need to.
if = If I can't take a rest, I will get burned out.
and then burnout reduces the efficiency of my work and leads to depression

so when we need to rest, necessarily we have to take a rest
Also, we have to take a = an active rest.
it is more important
whe = When we do something that is moderately active, we have a lot of fun and good hormones coming out.

so i think = So, I think that rest is more important than work.
Thank you.

Wow, wonderful. Rest is very needed for our health. Thank you for sharing, Byouncchul.