Out of sight, out of mind
This is one of those statements which give only a partial truth. In certain cases, we do forget those who are out of sight. Many cases, which are not immediately before us, are overlooked. We usually attend only to those things which are before us. But the workings of the mind are very complex. The absentmindedness of certain persons is a proof of the fact that they become unmindful of things before them in preference to things in their minds. In quite a number of cases, images of many things and persons come to our minds when they are not before us. This is particularly true of persons we love dearly. We may be unmindful of them when we are in their company but in their absence, we are continually thinking of them. However, generally speaking, the statement is correct and is applicable to most cases.