千里之行始於足下。
A journey of a thousand li starts with a single step.
Variant translations:
A journey of a thousand [miles] starts with a single step.
A journey of a thousand miles started with a first step.
A thousand-mile journey starts from your feet down there.
As translated by Dr. Hilmar Klaus
Every journey begins with a single step.
Source: Tao Te Ching, Ch. 64, line 12

“If you are depressed you are living in the past. If you are anxious you are living in the future. If you are at peace you are living in the present.”

Laozi

“Watch your thoughts; They become words. Watch your words; They become actions. Watch your actions; They become habits. Watch your habits; They become character. Watch your character; It becomes your destiny.”

Laozi

Source: yt

“When the center does not hold, the circle falls apart.”

Laozi

This is a paraphrase of lines in "The Second Coming" by William Butler Yeats.
Misattributed

“Thirty spokes unite at the single hub;
It is the empty space which makes the wheel useful.
Mold clay to form a bowl;
It is the empty space which makes the bowl useful.
Cut out windows and doors;
It is the empty space which makes the room useful.”

Laozi book Tao Te Ching

Source: Tao Te Ching, Ch. 11