One must apply oneself to the present and keep one's eyes firmly fixed on one's future goals.

人们必须让自己立足于现在，把眼光坚定地锁定未来目标。

《柯林斯英汉双解大词典》

It is difficult to apply oneself to a boring task.

致力于厌烦的工作是非常困难的。

youdao