A high vibrational frequency will resonate with emotions such as joy, clarity, peace, abundance, excitement, etc. While we often feel an emotion in response to something occurring, emotions act as an indicator to us of our own vibrational frequency at that moment.
Consider this example. A spouse comes home from a hard day at work to find a warm meal prepared for them by their significant other. At this moment, the spouse can choose to focus on the benevolence of the gesture or the toll of the hard day with each choice corresponding to both a frequency level and followed by an emotional response. Both choices are both completely valid and justified with a focus on the benevolence of the moment representing a high vibrational frequency and a consequence of a sense of joy for good food.
A high vibrational frequency allows you conscious access to these thoughts which resonate with high vibrational emotions we prefer (joy, clarity, abundance, traniquility, etc). These thoughts help us to make choices that serve to resonate with those emotions and affect our perceptions and interpretations of what we experience.
From high vibrational frequency and thoughts we perceive our surroundings differently. Simple things like perceiving someone of ignorance versus perceiving someone in need of knowledge can be a big difference. This one assessment can lead to a choice to confront / avoid versus support / understand. While both perceptions based on the same information are valid, the choice to adopt one perception over the other leads to different choices and at times, different results.