Chinese learners move from characters to idioms as the highest level. This free resource explains 「一心一路」 below.
Introducing the Chinese idiom 「一心一路」: its meaning and application are provided for your understanding.
Still wholeheartedly. There is only one thing in mind, no other considerations.
The Mandarin pronunciation of this idiom is :
yī xīn yī lù
while its Cantonese pinyin is :
yat1 sam1 yat1 lou6
Chinese idioms are vast in number, each carrying unique meanings and usages. With such variety, there’s a lot to learn and appreciate. Hopefully, these resources will aid you on your journey to mastering Chinese.

