The word "ప్రదక్షిణ" itself gives the reason for circling around god in temples. Each letter in the word has its own meaning.
ప్ర - Ruin our Sins
ద - Fulfill our desiresక్షి - Bless with a good birth in the next lifeణ - Dispel ignorance and bless us with self-awareness
This much sense is involved in the circle that we make in temples. Lord Vinayaka has circled around his parents and has benefited for the faith he had in circling around his parents. Hence circling around god resembles a circle made around the universe and a spiritual circle.
Oh God! I pray for you from all sides concentrating on you.
"భగవంతుడా! నేను అన్ని వైపుల నుంచి నిన్నే అనుసరిస్తూ ధ్యానిస్తున్నానని అర్ధం"