Don’t become discouraged.
Не падай духом. (Ne paday dukhom.)
"Even if you fail once, don’t lose heart."
"Даже если ты потерпишь неудачу один раз, не падай духом." (Dazhe esli ty poterpish' neudachu odin raz, ne paday dukhom.)
Working, often with a strict time limit or deadline.
to complete something despite difficulties
to become worse or decline in health
to start crying suddenly
to make a special effort to help someone
There is no point in worrying about past mistakes.