"心灵的行为，其中它对简单观念施展其力量，主要有以下三点：1. 将几个简单观念结合成一个复合观念，从而形成所有复杂观念。2. 第二是将两个观念，不管是简单的还是复杂的，放在一起，并列摆放，以便同时查看它们，而不是将它们合并为一个，从而获得所有关系观念。3. 第三是将它们从其真实存在中伴随的所有其他观念中分离出来。这称为抽象，从而形成所有一般观念。"

Simplified Meaning:

Our minds can do three main things with ideas. First, we can put together simple ideas to create more detailed and complex ones. Imagine how we combine simple blocks to build a castle. Second, we can compare two ideas side by side without mixing them. This helps us understand how they are related. For instance, if you look at an apple and an orange next to each other, you can see both similarities and differences without merging them into one fruit. Third, we can focus on an idea by removing details that aren't important at the moment, allowing us to think in general terms. It's like when you think of a 'dog' in general, not a specific dog you know, but the idea of any dog. Together, these abilities help us better understand and create new thoughts, solve problems, and learn about the world around us. Knowing how to use these mental tools can make our thinking clearer and more flexible in different situations.