I hope these are the ones you mean. This is kind of rough translation, but it gives the idea of what they mean!
I don’t want to assure you/It’s not always assured that you will achieve everything you desire if you try.
However, those that try their best will have their own rewards compared to those that did not even try.
Besides, it’s more fun and exciting (to keep trying) than letting go of your hard work and letting yourself fall into frustration/self-hatred.