这是一个祈使句，使用 'replace A with B' 的结构简洁有力地提出了具体的行动建议。
Positive Thinking. I am clearly a strong advocate for positive thinking as the best way to achieve your goals, but it turns out that it can lead to happiness too. Optimism and self-esteem are among the best indicators of people who lead happy lives. Happy people feel empowered, in control of their lives, and have a positive outlook on life. Action Steps: Make positive thinking a habit. In fact, this should be one of the first habits you develop. Get into the habit of squashing all negative thoughts and replacing them with positive ones. Instead of thinking "I can't," think "I can." It may sound corny, but it has worked for me every single time.
积极思维。我一直是积极思维作为达成目标最佳方式的坚定支持者，事实证明，它也能指引你走向幸福。乐观和自尊是那些拥有快乐生活的人最重要的标志。快乐的人感到充满活力，能够掌控自己的生活，并对生活抱有积极的看法。行动建议：将积极思维培养成一种习惯。事实上，这应该是你首先建立的习惯之一。养成消除所有负面想法并用积极想法取代它们的习惯。用“我能”的心态替代“我不能”。这听起来可能有些老套，但对我来说，每一次都卓有成效。