Have a plan, figuratively speaking, have skill and be sure. Both "planned" and "planned" mean "planned in mind". And "having a plan" focuses on having a comprehensive consideration and solution to the problem beforehand, or acting calmly because you have an idea in your heart; "Knowing what it is" focuses on understanding the objective situation and is very sure.

Source: Stone "Painting Bamboo in Valley Chinese": "So when painting bamboo, you must first have bamboo in your heart."

Wang Xizhi, a famous calligrapher in the Eastern Jin Dynasty, began to practice calligraphy at the age of 7. He practices calligraphy very hard. He often practices calligraphy by the pool, and the water in the pool is dyed black. At the age of 33, he wrote Preface to Lanting Collection, and at the age of 37, he wrote Huang Tingjing. Later, due to the replacement of the writing board, the craftsman found that Wang Xizhi's brushwork was very strong, and the handwriting had penetrated into the board for three minutes. Later, it was used to describe the vigorous brushwork of calligraphy, and also to describe the profound and accurate opinions and arguments. The eighty-seventh volume of Shuo's Genealogy quotes Zhang Huaiguan's Shu Duan Wang Xizhi in the Tang Dynasty: "Wang Xizhi's book is a blessing book, carved with exquisite brushwork."