A habit is a behavior that has been repeated enough times to become automatic.
The process of habit formation begins with trial and error. Whenever you encounter a new situation in life, your brain must make a decision. The habit-forming process now begins. Try, fail, learn, try again, try differently – with practice, the useless movements fade away and the useful actions get reinforced. That’s a habit forming.

Habits are, simply, reliable solutions to recurring problems in our environment.
Habits are mental shortcuts learned from experience. In a sense, a habit is just a memory of steps you previously followed to solve a problem in the past. Whenever the conditions are right, you draw on this memory and automatically apply the same solution. The primary reason the brain remembers the past is to better predict what will work in the future.
-James Clear

“Successful people are simply those with successful habits.”
-Brian Tracy

“First forget inspiration. Habit is more dependable. Habit will sustain you whether you’re inspired or not.”
-Octavia Butler

“Your habits will determine your future.”
-Jack Canfield

“Chains of habit are too light to be felt until they are too heavy to be broken.”
-Warren Buffett

“Quality is not an act; it is a habit.”
-Aristotle

“Depending on what they are, our habits will either make us or break us. We become what we repeatedly do.”
-Sean Covey

“Healthy habits are learned in the same way as unhealthy ones – through practice.”
-Wayne Dyer

“Motivation is what gets you started. Habit is what keeps you going.”
-Jim Ryun

“Ninety-nine percent of the failures come from people who have the habit of making excuses.”
-George Washington Carver