大乘起信論義記 3.319

3.319

復次，信成就發心者，發何等心？略說有三種。云何為三？一者、直心，正念真如法故。二者、深心，樂集一切諸善行故。三者、大悲心，欲拔一切眾生苦故。

Furthermore, as for those whose faith is perfected and who generate the mind, what kind of mind do they generate? Briefly stated, there are three kinds. What are the three? The first is the straightforward mind, because of correctly being mindful of the dharma of tathatā. The second is the profound mind, because of delighting in accumulating all wholesome practices. The third is the mind of great compassion, because of wishing to pull out the suffering of all sentient beings.