More than 1,100 people were expected to hear Bush's speech at a banquet for Fort Worth Christian School.
School leaders said they requested Bush to speak because he has been a leader in education as Texas governor and then as U.S. president. The school has more than 860 students and is celebrating its 51st year.
Bush and his wife moved to Dallas last year after his second term ended. He has had several speaking engagements since then.
Recently, President Obama enlisted Bush and former President Clinton to spearhead private fundraising efforts for the rebuilding in earthquake-ravaged Haiti.
Last week, Bush visited former Vice President Dick Cheney at his Washington D.C. home just days after Cheney suffered another mild heart attack.