该句使用一般现在时表达普遍规律，适合作为励志格言。
Knowledge is gained through inquiry: if you don't understand, ask.
A dull knife is sharpened on stone; even a slow learner can progress by observing others. Learning from others leads to improvement.
Asking is not a burden, nor does it cost anything. Those who are skilled at asking possess abundant knowledge.
Refusing guidance leads to unnecessary detours. Pretending to know what you do not will only hinder your growth.
Even the wise may err, just as the foolish may occasionally stumble upon the truth.
If you cannot do something, learn; if you do not know, ask. Those ashamed to ask will never make progress.
The learned continue to ask even when they understand; the ignorant do not ask even when they are lost.
Just as water is better when filtered three times, proficiency comes from learning from many masters.
As fingers vary in length, knowledge varies in depth. Learning has no fixed order, and those who have mastered a craft can be teachers.
True learning comes from continuous inquiry. To master a skill, listen to others.
Listen to anyone who offers beneficial advice, even a child.
Be like a bee gathering nectar from many flowers; by asking many people, one becomes an expert.
Old ginger is the spiciest, and elders possess the most experience. Asking others is not a loss, merely a small social effort.
Fearing to ask the way leads to getting lost. A proactive mouth avoids wasted journeys.
A book left unread is like a piece of waste paper. (English Proverb)
Those who never ask will always remain in ignorance. (East African Proverb)
An attentive ear can listen from dawn till dusk. (African Proverb)
Nothing in the world is difficult if one is determined to climb.
If one does not work hard in youth, one will regret it in old age.
An inch of time is worth an inch of gold, but gold cannot buy an inch of time.
Youth does not return, and a single morning never comes twice.
Encourage yourself in the moment, for time waits for no one.
Time flies like an arrow, and the sun and moon pass like a shuttle.
Flowers may bloom again, but one can only be young once.
A great bird rises with the wind once a day, soaring ninety thousand miles into the sky. —— Li Bai
Great achievers in history possessed not only extraordinary talent but also unyielding perseverance. —— Su Shi
学问学问，不懂就问。
刀钝石上磨，人笨人前学。以人为师能进步。
试试并非受罪，问问并不吃亏。善于发问的人，知识丰富。
不听指点，多绕弯弯。不懂装懂，永世饭桶。
智者千虑，必有一失；愚者千虑，必有一得。
不能则学，不知则问，耻于问人，决无长进。
学问渊博的人，懂了还要问；学问浅薄的人，不懂也不问。
井淘三遍吃好水，人从三师武艺高。
手指有长有短，知识有高有低。学无先后，达者为师。
边学边问，才有学问。若要精，人前听。
只要是有益的话，小孩的话也要听。
要学蜜蜂采百花，问遍百家成行家。
老姜辣味大，老人经验多。请教别人不折本，舌头打个滚。
怕问路，要迷路。嘴勤不走冤枉路。
书籍备而不读如废纸。（英国谚语）
不问的人永远和愚昧在一起。（东非谚语）
耳朵没有底，可以从早听到晚。（非洲谚语）
世上无难事，只要肯登攀
少壮不努力，老大徒伤悲。
一寸光阴一寸金，寸金难买寸光阴。
盛年不重来，一日难再晨。
及时宜自勉，岁月不待人。
光阴似箭，日月如梭。
花有重开时，人无再少年。
大鹏一日同风起，扶摇直上九万里。 —— 李白
古之立大事者，不惟有超世之才，亦必有坚忍不拔之志。 —— 苏轼