True change is within; leave the outside as it is.

Instead of being concerned that you have no office, be concerned to think how you may fit yourself for office. Instead of being concerned that you are not known, seek to be worthy of being known.

At fifteen my heart was set on learning; at thirty I stood firm; at forty I had no more doubts; at fifty I knew the will of heaven; at sixty my ear was obedient; at seventy I could follow my heart's desire without overstepping the boundaries of what was right.

Here the ways of men part: if you wish to strive for peace of soul and pleasure, then believe; if you wish to be a devotee of truth, then inquire.

Don't gain the world and lose your soul, wisdom is better than silver or gold.

What is important is not the quantity of your knowledge but its quality. You can know many things without knowing the most important.