This quote suggests that all negative actions, thoughts, and consequences arise from our inability to be comfortable with ourselves and our solitude. It implies that when we are unable to handle being alone, we may engage in harmful behaviors or make poor decisions in an attempt to escape from the discomfort of solitude.

The first part of the quote, "All evil stems from this-that we do," can be interpreted as the idea that our actions, often driven by our inability to be at peace with ourselves, lead to negative outcomes. We may act impulsively, make poor choices, or hurt others, all because we are trying to fill a void within ourselves or escape from our own thoughts and feelings.

The second part of the quote, "Know how to handle your solitude," is a call to action. It suggests that we need to learn how to be comfortable in our own company, to be able to sit with our thoughts and feelings without needing to escape from them. By learning to handle our solitude, we can reduce the likelihood of engaging in harmful behaviors and improve our overall wellbeing.

In today’s world, this quote is particularly relevant. We live in a society that is constantly connected and always busy. It’s easy to avoid solitude by distracting ourselves with work, social media, or other activities. However, this constant distraction can lead to a lack of self-awareness and self-understanding, which can in turn lead to negative behaviors and outcomes.

In terms of personal development, this quote suggests the importance of self-reflection and mindfulness. By spending time alone and becoming comfortable with our solitude, we can better understand ourselves and our motivations. This can help us make better decisions, improve our relationships, and lead more fulfilling lives. We can also learn to appreciate the value of solitude, using it as a time for rest, reflection, and personal growth, rather than seeing it as something to be avoided.