This quote suggests that true moral growth or improvement is primarily about learning to see beyond the immediate present and our immediate desires or impulses. Being "weaned from the momentary" implies a process of detachment or separation from the transient, ephemeral, or fleeting aspects of life. It suggests a maturing or growth process where one moves from being entangled in the immediate to a state where one can see the bigger picture, considering the broader implications of one’s actions and decisions.

In essence, the quote emphasizes the concept of delayed gratification, where one foregoes immediate pleasure for the sake of long-term benefits. It argues that true moral strength lies not in succumbing to immediate desires but in the ability to resist them for the sake of higher principles or long-term goals. This concept is deeply rooted in various philosophical and religious traditions that value self-control, discipline, and foresight.

Applying this idea to today’s world, one could argue that many of the problems we face are rooted in our tendency to prioritize the immediate over the long-term. For example, in the realm of environmental sustainability, the pursuit of immediate economic gain often leads to practices that are harmful in the long run. Similarly, in our personal lives, the desire for immediate gratification can lead to unhealthy lifestyle choices, financial irresponsibility, and strained relationships.

In terms of personal development, this quote could be interpreted as a call to develop the ability to resist immediate gratification in favor of long-term benefits. This might involve cultivating discipline, patience, and the ability to make decisions based on principles rather than impulses. It could also involve developing a deeper understanding of the potential long-term consequences of our actions and decisions, and using this understanding to guide our behavior.