求翻译：目标既定，在学习和实践过程中无论遇到什么困难都不灰心丧气，不轻易改变自己决定的目标，而坚持不懈地去学习和奋斗，如此才会有所成就，而达到自己的目的。是什么意思？

Targets established, regardless of the difficulties encountered in the process of learning and practice are not discouraged, not easily change their destination to be decided, and tirelessly to learn and hard, so will only succeed and achieve their own ends.