The most important invocations to Maha Ganapati

gaņānām tvā gaņapati(gu)m havāmahe kavim kavīnām upamashravastamam
jyeşhţharājam brahmaņām brahmaņaspata ā naĥ shŗņvan ūtibhiĥ sīda sādanam

Meaning:
We invoke (havāmahe) the Lord of the celestial hosts (gaņānām gaņapatim), the Seer among the Seers (kavim kavīnām) who is of superlative fame (upamashravastamam). O the highest Lord (jyeşhţharājam), the veritable Brahman (brahmaņām brahmaņaspata), hear us (shŗņvan) and fulfill (sādanam) in us Thy Grace and protection (ūtibhiĥ).