To think is to feel, to pay attention, to compare, to judge, to reflect, to imagine, to reason, to desire, to have passions, to hope, to fear, to feel sensations, to feel memories, to feel relationships, to feel desires, always to feel.
By thinking we become aware of being, but conversely we must already exist in order to think, and we cannot speak without thinking, that is, without attaching an idea to our words. But thinking, like acting or feeling, is reacting to the environment, having something in mind, paying attention to something, thinking about it.