As a leader your time is mostly likely valuable. The bigger your realm of influence, the more value you place on your time due to the amount of your responsibilities. As leaders we must find men and women that are worth spending the most time with. Now, first we must understand the difference though, of those we are investing in and those we are spending time with to glean from their knowledge and expertise.
There is an old saying that says,
As a leader you must examine the people you surround yourself with. For you are the sum of the 5 people that you spend the most time with. If you are not happy with who you are, or where you are headed, then change you who spend time with. I personally try to spend time with men and women who are smarter than me, have a greater faith than me, and that can mentor me and speak into my life. I am always desiring to grow. To make yourself a better leader surround yourself with the kind of leaders that you want to be.
A word of caution, would be to be wary of the loudest voice. Evaluate those who speak into your life and weigh out what each voice has to say. That loudest voice just might be that of a cowboy and may not necessarily be the best. Two of the most influential people in my life are two of the quietest, and provide wisdom only when needed or asked for, and has never steered me wrong. (Learn more about the cowboy and the shepherd mentality)
This can go for any area of life. If you desire to be a better parent, surround yourself with the type of parents you want to be. If you desire to be a better money manager, surround yourself with people that manage money well. The list can go on and on. As we mature, we must continually evaluate our lives, our friendships, and especially our closest relationships so that we can continue to grow in our realm of influence.
Now, the story is a little different when we look at who you are investing into. It is always important to invest into or mentor somebody that is younger or less experienced in a realm that you are. But, in this you must be careful. There are those who will take you for granted and waste your time. Jesus teaches us in Matthew 7:6 not to throw our pearls before swine. Do not give valuable time and wisdom to those who will not listen, and only trample it under foot. Be wise in who you invest yourself into. Let the Spirit guide your decisions on whom to invest into.
In closing, you are the sum of the 5 people you spend the most time with. Evaluate your relationships, and make the changes that are necessary to become the man or woman you desire to become in whatever realm you inhabit.