凡事要尽力而为，更要量力而行。

One needs to do their best in all things, and more importantly work within their abilities.

Source: Tatoeba

Sentence Composition

1 凡事 fánshì everything
=2 要 yāo (bound form) to demand; to coerce
=2 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=2 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
=3 尽力而为 jìnlìérwéi
  1. to try one's utmost
  2. to strive
=3 尽力而为 jìnlì'érwéi to spare no effort in doing something
=4 更 gēng
  1. to change or replace
  2. to experience
  3. one of the five two-hour periods into which the night was formerly divided
  4. watch (e.g. of a sentry or guard)
=4 更 gèng
  1. more
  2. even more
  3. further
  4. still
  5. still more
=5 要 yāo (bound form) to demand; to coerce
=5 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=5 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
=6 量力而行 liànglìérxíng
  1. to assess one's capabilities and act accordingly (idiom); to act within one's competence
  2. One does what one can.
=6 量力而行 liànglì'érxíng to act according to one's capability; to weigh one's abilities and do it; cut one's coat according to one's cloth