Mondays are the most challenging day of the week. After a fun weekend full of activities with friends and family, Monday morning rolls around and you just need a little extra motivation to get going again and give the week your all!

Here are 22 of my favorite quotes, by category, that are great life lessons. Take a moment to reflect on them, set your goals for the week and get them accomplished.

1. Inspirational

"Believe you can and you're halfway there." ― Theodore Roosevelt

2. Success

"Don't aim for success if you want it; just do what you love and believe in, and it will come naturally." ― David Frost

3. Life

"We do not remember days, we remember moments." ― Cesare Pavese

4. Leadership

"The quality of a leader is reflected in the standards they set for themselves." ― Ray Kroc

5. Learning

"Live as if you were to die tomorrow. Learn as if you were to live forever." ― Mahatma Gandhi

6. Future

"The future belongs to those who believe in the beauty of their dreams." ― Eleanor Roosevelt

7. Friendship

“Many people will walk in and out of your life, but only true friends will leave footprints in your heart” ― Eleanor Roosevelt

8. Beauty

"Everything has beauty, but not everyone sees it." ― Confucius

9. Love

"Kindness in words creates confidence. Kindness in thinking creates profoundness. Kindness in giving creates love." ― Lao Tzu

10. Thankful

"Gratitude is the fairest blossom which springs from the soul." ― Henry Ward Beecher

11. Positive

"Once you replace negative thoughts with positive ones, you'll start having positive results." ― Willie Nelson

12. Chance

"Take chances, make mistakes. That's how you grow. Pain nourishes your courage. You have to fail in order to practice being brave." ― Mary Tyler Moore

13. Change

"If you don't like something, change it. If you can't change it, change your attitude." ― Maya Angelou

14. Courage

"Courage is being scared to death... and saddling up anyway." ― John Wayne

15. Education

"The goal of education is the advancement of knowledge and the dissemination of truth." ― John F. Kennedy

16. Failure

"It's fine to celebrate success but it is more important to heed the lessons of failure." ― Bill Gates

17. Patience

"Patience, persistence and perspiration make an unbeatable combination for success." ― Napoleon Hill

18. Respect

"Respect yourself if you would have others respect you." ― Baltasar Gracian

19. Strength

"Where there is no struggle, there is no strength." ― Oprah Winfrey

20. Trust

“Self-trust is the first secret of success.” ― Ralph Waldo Emerson

21. Time

"Yesterday's the past, tomorrow's the future, but today is a gift. That's why it's called the present." ― Bil Keane

22. Wisdom

"Step with care and great tact, and remember that Life's a Great Balancing Act." ― Dr. Seuss

What's your favorite quote? Share your thoughts in the comments below!