It is true what they have said about true friendships. You can go several years without seeing someone, but when you do come together it is as if time has stand still. The friendships you developed years ago are still intact; time and changes has not interrupted the process and flow of your friendships. Treasure your friendships, but do not allow yourself to worry about a lack of coming together. In due time it will happen and it will be a natural and sincere reunion with no unease.
I believe knowledge is something we gain through our life