The mind reflects what its environment feed it just as surely as the body reflects the food you feed it. Mind food is your environment which contains all the countless things which influence you subconscious mind.

He who must needs have company, must needs have sometimes bad company. — Thomas Browne

Environment shapes us, makes us think the way we do. Try to name just one habit or one mannerism you have, which you did not pick from other people. Relatively minor things, like the way we walk, cough, hold a cup, our preferences for entertainment, clothing etc all stem in very large part of environment. Most important the size of your thinking, your goals your attitude, your very personality is formed by your environment.

Prolonged association with negative people makes us think negatively; close contact with petty individuals develops petty habits in us. We are being conditioned to relish of our getting of low quality by such environment. These guys pull us down because they themselves cannot cross that threshold. On the brighter side, companionship with people with big ideas raises the level of our thinking; close contacts with ambitious people gives us ambition. If we associate ourselves with men of good quality we subconsciously esteem our own reputation.

It is better to be alone than in bad company but remember if you are lonely when you’re alone, you are again in a bad company. So do check your company.